Duplicating a plain fails: internal error during "Retrieving data".

Before coming to the real problem, side question:

how do I duplicate a "plan" within the web client?

As I was used to use the eclipse client in order to simply duplicate my current plan when going for the next iteration ... but now:

Then I used RTC-Client-p2Repo-3.0.1.6iFix2.zip to install RTC (also put a 64 bit xulrunner on my system).

I added this to eclipse.ini:

I can start the RTC client and check out my work items. But today I tried to duplicate a plan for the next iteration, and ended up with: 

java.lang.NoClassDefFoundError: org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader
	at com.ibm.team.rtc.common.scriptengine.internal.types.api.ApiTypeResolver.resolveClass(ApiTypeResolver.java:89)
	at com.ibm.team.rtc.common.scriptengine.internal.types.api.ApiTypeResolver.resolve(ApiTypeResolver.java:57)
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature.loadUri(DojoFeature.java:231)
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature.access$3(DojoFeature.java:190)
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature$1.call(DojoFeature.java:155)
	at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
	at org.mozilla.javascript.gen.c2._c7({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"}:141)
	at org.mozilla.javascript.gen.c2.call({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"})
	at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:86)
	at org.mozilla.javascript.gen.c2._c4({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"}:76)
	at org.mozilla.javascript.gen.c2.call({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"})
	at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
	at org.mozilla.javascript.gen.c2._c18({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"}:411)
	at org.mozilla.javascript.gen.c2.call({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"})
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature$3.call(DojoFeature.java:179)
	at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:66)
	at org.mozilla.javascript.gen.c12._c0({"Bundle-SymbolicName":"com.ibm.team.apt.shared.client", "path":"\/resources\/internal\/progress", "name":"ProgressInformation.js"}:12)
	at org.mozilla.javascript.gen.c12.call({"Bundle-SymbolicName":"com.ibm.team.apt.shared.client", "path":"\/resources\/internal\/progress", "name":"ProgressInformation.js"})
	at org.mozilla.javascript.gen.c12.exec({"Bundle-SymbolicName":"com.ibm.team.apt.shared.client", "path":"\/resources\/internal\/progress", "name":"ProgressInformation.js"})
	at com.ibm.team.rtc.common.scriptengine.environment.AbstractScriptFeature.evalScript(AbstractScriptFeature.java:64)
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature.loadUri(DojoFeature.java:255)
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature.access$3(DojoFeature.java:190)
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature$1.call(DojoFeature.java:155)
	at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
	at org.mozilla.javascript.gen.c2._c7({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"}:141)
	at org.mozilla.javascript.gen.c2.call({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"})
	at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:86)
	at org.mozilla.javascript.gen.c2._c4({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"}:76)
	at org.mozilla.javascript.gen.c2.call({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"})
	at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
	at org.mozilla.javascript.gen.c2._c18({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"}:411)
	at org.mozilla.javascript.gen.c2.call({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"})
	at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:401)
	at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3003)
	at org.mozilla.javascript.gen.c2.call({"Bundle-SymbolicName":"org.dojotoolkit.dojo", "path":"resources\/_base\/_loader", "name":"loader.js"})
	at com.ibm.team.rtc.common.scriptengine.environment.dojo.DojoFeature$3.call(DojoFeature.java:179)
	at org.mozilla.javascript.ScriptableObject.callMethod(ScriptableObject.java:1862)
	at com.ibm.team.rtc.common.scriptengine.environment.ScriptingHelperImplementation$4.run(ScriptingHelperImplementation.java:141)
	at com.ibm.team.rtc.common.scriptengine.environment.ScriptingHelperImplementation$4.run(ScriptingHelperImplementation.java:1)
	at com.ibm.team.rtc.common.scriptengine.environment.AbstractScriptEnvironment.execute(AbstractScriptEnvironment.java:74)
	at com.ibm.team.rtc.common.scriptengine.environment.ScriptingHelperImplementation.dojoRequire(ScriptingHelperImplementation.java:138)
	at com.ibm.team.rtc.common.scriptengine.environment.ScriptingHelperImplementation.getConstructor(ScriptingHelperImplementation.java:151)
	at com.ibm.team.rtc.common.scriptengine.ScriptUtilities$1.run(ScriptUtilities.java:30)
	at com.ibm.team.rtc.common.scriptengine.environment.AbstractScriptEnvironment.execute(AbstractScriptEnvironment.java:74)
	at com.ibm.team.rtc.common.scriptengine.ScriptUtilities.newInstance(ScriptUtilities.java:27)