Provisioning exception

hi,
i have just unzipped rtc express c full, rtc, server and Junit source and when i start rtc client, error log view shows:
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org.eclipse.equinox.internal.provisional.p2.core.ProvisionException: Nessun repository trovato su file:/C:/RTC-2.0.1/source/
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:471)
at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:435)
at org.eclipse.equinox.internal.p2.reconciler.dropins.Activator.loadMetadataRepository(Activator.java:83)
at org.eclipse.equinox.internal.p2.reconciler.dropins.DropinsRepositoryListener.getMetadataRepository(DropinsRepositoryListener.java:171)
at org.eclipse.equinox.internal.p2.reconciler.dropins.DropinsRepositoryListener.added(DropinsRepositoryListener.java:62)
at org.eclipse.equinox.internal.provisional.p2.directorywatcher.DirectoryWatcher.processFile(DirectoryWatcher.java:200)
at org.eclipse.equinox.internal.provisional.p2.directorywatcher.DirectoryWatcher.scanDirectories(DirectoryWatcher.java:161)
at org.eclipse.equinox.internal.provisional.p2.directorywatcher.DirectoryWatcher.poll(DirectoryWatcher.java:108)
at org.eclipse.equinox.internal.p2.reconciler.dropins.Activator.watchDropins(Activator.java:472)
at org.eclipse.equinox.internal.p2.reconciler.dropins.Activator.start(Activator.java:158)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:1009)
at java.security.AccessController.doPrivileged(AccessController.java:246)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:1003)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:984)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:355)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1074)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:616)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:508)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:299)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:489)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:211)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:321)
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why?