RTC Eclipse Client 6.0 doesn't load workspace

Hi to all,
I'm using RTC Eclipse Client 6.0 (.ZIP version) on windows 7 32 bit.
I have not administrator rights.
The first time I launched RTC I've created a repository connection, I've managed my project areas, but from the second time I launch RTC, I receive almost always an error
"An error has occurred. See the log file" i thje log there is:

!SESSION 2015-10-20 17:03:25.007 -----------------------------------------------
eclipse.buildId=unknown
java.fullversion=JRE 1.6.0 IBM J9 2.4 Windows 7 x86-32 jvmwi3260sr16-20141216_227499 (JIT enabled, AOT enabled)
J9VM - 20141216_227499
JIT  - r9_20140523_64469ifx3
GC   - GA24_Java6_SR16_20141216_1020_B227499
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=it_IT
Command-line arguments:  -os win32 -ws win32 -arch x86

!ENTRY org.eclipse.osgi 4 0 2015-10-20 17:03:28.878
!MESSAGE An error occurred while automatically activating bundle com.ibm.team.process.rcp.ui (199).
!STACK 0
org.osgi.framework.BundleException: Exception in com.ibm.team.process.internal.rcp.ui.ProcessRCPUIPlugin.start() of bundle com.ibm.team.process.rcp.ui.
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:806)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
    at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:642)
    at java.lang.J9VMInternals.verifyImpl(Native Method)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:73)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:71)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:133)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.QuickSearch.createQuickSearch(QuickSearch.java:305)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.QuickSearch.<init>(QuickSearch.java:260)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.SearchBarTrim.fill(SearchBarTrim.java:36)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.renderTrim(TrimBarManager2.java:447)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.processAdditions(TrimBarManager2.java:378)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.build(TrimBarManager2.java:330)
    at org.eclipse.ui.internal.menus.TrimBarManager2.update(TrimBarManager2.java:109)
    at org.eclipse.ui.internal.WorkbenchWindow.updateLayoutDataForContents(WorkbenchWindow.java:3834)
    at org.eclipse.ui.internal.WorkbenchWindow.setLayoutDataForContents(WorkbenchWindow.java:3847)
    at org.eclipse.ui.internal.WorkbenchWindow.createDefaultContents(WorkbenchWindow.java:1130)
    at org.eclipse.ui.internal.WorkbenchWindowConfigurer.createDefaultContents(WorkbenchWindowConfigurer.java:623)
    at org.eclipse.ui.application.WorkbenchWindowAdvisor.createWindowContents(WorkbenchWindowAdvisor.java:300)
    at org.eclipse.ui.internal.WorkbenchWindow.createContents(WorkbenchWindow.java:1016)
    at org.eclipse.jface.window.Window.create(Window.java:431)
    at org.eclipse.ui.internal.Workbench$22.runWithException(Workbench.java:1208)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
    at org.eclipse.ui.internal.Workbench$31.runWithException(Workbench.java:1567)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2548)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
Caused by: java.lang.NullPointerException
    at com.ibm.team.repository.transport.client.RemoteTeamServer.buildProxyCredentials(RemoteTeamServer.java:682)
    at com.ibm.team.repository.transport.client.RemoteTeamServer.setProxy(RemoteTeamServer.java:717)
    at com.ibm.team.repository.client.internal.TeamRepository.setProxy(TeamRepository.java:1475)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.setProxyForRepo(RepositoryProxyListener.java:56)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.setProxyForAllRepos(RepositoryProxyListener.java:77)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.<init>(RepositoryProxyListener.java:91)
    at com.ibm.team.process.internal.rcp.ui.ProcessRCPUIPlugin.start(ProcessRCPUIPlugin.java:141)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(AccessController.java:338)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    ... 65 more
Root exception:
java.lang.NullPointerException
    at com.ibm.team.repository.transport.client.RemoteTeamServer.buildProxyCredentials(RemoteTeamServer.java:682)
    at com.ibm.team.repository.transport.client.RemoteTeamServer.setProxy(RemoteTeamServer.java:717)
    at com.ibm.team.repository.client.internal.TeamRepository.setProxy(TeamRepository.java:1475)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.setProxyForRepo(RepositoryProxyListener.java:56)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.setProxyForAllRepos(RepositoryProxyListener.java:77)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.<init>(RepositoryProxyListener.java:91)
    at com.ibm.team.process.internal.rcp.ui.ProcessRCPUIPlugin.start(ProcessRCPUIPlugin.java:141)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(AccessController.java:338)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
    at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:642)
    at java.lang.J9VMInternals.verifyImpl(Native Method)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:73)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:71)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:133)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.QuickSearch.createQuickSearch(QuickSearch.java:305)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.QuickSearch.<init>(QuickSearch.java:260)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.SearchBarTrim.fill(SearchBarTrim.java:36)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.renderTrim(TrimBarManager2.java:447)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.processAdditions(TrimBarManager2.java:378)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.build(TrimBarManager2.java:330)
    at org.eclipse.ui.internal.menus.TrimBarManager2.update(TrimBarManager2.java:109)
    at org.eclipse.ui.internal.WorkbenchWindow.updateLayoutDataForContents(WorkbenchWindow.java:3834)
    at org.eclipse.ui.internal.WorkbenchWindow.setLayoutDataForContents(WorkbenchWindow.java:3847)
    at org.eclipse.ui.internal.WorkbenchWindow.createDefaultContents(WorkbenchWindow.java:1130)
    at org.eclipse.ui.internal.WorkbenchWindowConfigurer.createDefaultContents(WorkbenchWindowConfigurer.java:623)
    at org.eclipse.ui.application.WorkbenchWindowAdvisor.createWindowContents(WorkbenchWindowAdvisor.java:300)
    at org.eclipse.ui.internal.WorkbenchWindow.createContents(WorkbenchWindow.java:1016)
    at org.eclipse.jface.window.Window.create(Window.java:431)
    at org.eclipse.ui.internal.Workbench$22.runWithException(Workbench.java:1208)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
    at org.eclipse.ui.internal.Workbench$31.runWithException(Workbench.java:1567)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2548)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1408)

!ENTRY org.eclipse.osgi 4 0 2015-10-20 17:03:28.910
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: com.ibm.team.process.rcp.ui.teamnavigator.IConnectedProjectAreaRegistryListener
    at java.lang.J9VMInternals.verifyImpl(Native Method)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:73)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:71)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:133)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.QuickSearch.createQuickSearch(QuickSearch.java:305)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.QuickSearch.<init>(QuickSearch.java:260)
    at com.ibm.team.workitem.rcp.ui.internal.quicksearch.SearchBarTrim.fill(SearchBarTrim.java:36)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.renderTrim(TrimBarManager2.java:447)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.processAdditions(TrimBarManager2.java:378)
    at org.eclipse.ui.internal.menus.TrimBarManager2$STrimBuilder.build(TrimBarManager2.java:330)
    at org.eclipse.ui.internal.menus.TrimBarManager2.update(TrimBarManager2.java:109)
    at org.eclipse.ui.internal.WorkbenchWindow.updateLayoutDataForContents(WorkbenchWindow.java:3834)
    at org.eclipse.ui.internal.WorkbenchWindow.setLayoutDataForContents(WorkbenchWindow.java:3847)
    at org.eclipse.ui.internal.WorkbenchWindow.createDefaultContents(WorkbenchWindow.java:1130)
    at org.eclipse.ui.internal.WorkbenchWindowConfigurer.createDefaultContents(WorkbenchWindowConfigurer.java:623)
    at org.eclipse.ui.application.WorkbenchWindowAdvisor.createWindowContents(WorkbenchWindowAdvisor.java:300)
    at org.eclipse.ui.internal.WorkbenchWindow.createContents(WorkbenchWindow.java:1016)
    at org.eclipse.jface.window.Window.create(Window.java:431)
    at org.eclipse.ui.internal.Workbench$22.runWithException(Workbench.java:1208)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
    at org.eclipse.ui.internal.Workbench$31.runWithException(Workbench.java:1567)
    at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2548)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
Caused by: org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter$TerminatingClassNotFoundException: An error occurred while automatically activating bundle com.ibm.team.process.rcp.ui (199).
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:121)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
    at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:642)
    ... 50 more
Caused by: org.osgi.framework.BundleException: Exception in com.ibm.team.process.internal.rcp.ui.ProcessRCPUIPlugin.start() of bundle com.ibm.team.process.rcp.ui.
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:806)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)
    ... 59 more
Caused by: java.lang.NullPointerException
    at com.ibm.team.repository.transport.client.RemoteTeamServer.buildProxyCredentials(RemoteTeamServer.java:682)
    at com.ibm.team.repository.transport.client.RemoteTeamServer.setProxy(RemoteTeamServer.java:717)
    at com.ibm.team.repository.client.internal.TeamRepository.setProxy(TeamRepository.java:1475)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.setProxyForRepo(RepositoryProxyListener.java:56)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.setProxyForAllRepos(RepositoryProxyListener.java:77)
    at com.ibm.team.process.internal.rcp.ui.RepositoryProxyListener.<init>(RepositoryProxyListener.java:91)
    at com.ibm.team.process.internal.rcp.ui.ProcessRCPUIPlugin.start(ProcessRCPUIPlugin.java:141)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(AccessController.java:338)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    ... 65 more


I've this error 4 times on 5. Can you help me please?
Thanks in advance