eclipse.buildId=4.5.2.M20160212-1500
java.version=1.8.0_40
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.jee.product -product org.eclipse.epp.package.jee.product -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.jee.product -product org.eclipse.epp.package.jee.product -data file:/E:/Work/WSEclipseMars/ -product org.eclipse.epp.package.jee.product

org.eclipse.mylyn.tasks.core
Error
Wed Apr 13 08:49:39 CEST 2016
Synchronization failed

org.eclipse.core.runtime.AssertionFailedException: null argument:
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)
	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)
	at org.eclipse.mylyn.tasks.core.data.TaskAttribute.setValue(TaskAttribute.java:659)
	at org.eclipse.mylyn.tasks.core.data.TaskAttributeMapper.setValue(TaskAttributeMapper.java:348)
	at org.tuleap.mylyn.task.core.internal.repository.TuleapAttributeMapper.setValue(TuleapAttributeMapper.java:57)
	at org.eclipse.mylyn.tasks.core.data.TaskAttributeMapper.setRepositoryPerson(TaskAttributeMapper.java:334)
	at org.eclipse.mylyn.tasks.core.data.TaskCommentMapper.applyTo(TaskCommentMapper.java:158)
	at org.tuleap.mylyn.task.core.internal.data.TuleapArtifactMapper.addComment(TuleapArtifactMapper.java:524)
	at org.tuleap.mylyn.task.core.internal.data.converter.ArtifactTaskDataConverter.populateTaskDataConfigurableFields(ArtifactTaskDataConverter.java:163)
	at org.tuleap.mylyn.task.core.internal.data.converter.ArtifactTaskDataConverter.populateTaskData(ArtifactTaskDataConverter.java:222)
	at org.tuleap.mylyn.task.core.internal.repository.TuleapRepositoryConnector.performReportOrCustomQuery(TuleapRepositoryConnector.java:282)
	at org.tuleap.mylyn.task.core.internal.repository.TuleapRepositoryConnector.performQuery(TuleapRepositoryConnector.java:218)
	at org.eclipse.mylyn.internal.tasks.core.sync.SynchronizeQueriesJob.synchronizeQuery(SynchronizeQueriesJob.java:311)
	at org.eclipse.mylyn.internal.tasks.core.sync.SynchronizeQueriesJob.synchronizeQueries(SynchronizeQueriesJob.java:268)
	at org.eclipse.mylyn.internal.tasks.core.sync.SynchronizeQueriesJob.run(SynchronizeQueriesJob.java:199)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)