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java.lang.Throwable: 	at com.intellij.openapi.project.DumbServiceImpl.scheduleCacheUpdate(DumbServiceImpl.java:167)	at com.intellij.openapi.project.DumbServiceImpl.queueTask(DumbServiceImpl.java:92)	at com.intellij.openapi.roots.impl.ProjectRootManagerComponent.doSynchronizeRoots(ProjectRootManagerComponent.java:300)	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl.fireRootsChanged(ProjectRootManagerImpl.java:419)	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl.access$100(ProjectRootManagerImpl.java:55)	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl$BatchSession.fireChange(ProjectRootManagerImpl.java:112)	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl$BatchSession.rootsChanged(ProjectRootManagerImpl.java:125)	at com.intellij.openapi.roots.impl.ProjectRootManagerImpl.mergeRootsChangesDuring(ProjectRootManagerImpl.java:324)	at com.intellij.openapi.externalSystem.service.project.AbstractIdeModifiableModelsProvider.commit(AbstractIdeModifiableModelsProvider.java:367)	at org.intellij.plugins.ceylon.ide.ceylonCode.model.IdeaCeylonProject.doWithLibraryModel$priv$(IdeaCeylonProject.ceylon:384)	at org.intellij.plugins.ceylon.ide.ceylonCode.model.IdeaCeylonProject.addLibraries$priv$$canonical$(IdeaCeylonProject.ceylon:395)	at org.intellij.plugins.ceylon.ide.ceylonCode.model.IdeaCeylonProject.addLibraries$priv$(IdeaCeylonProject.ceylon:393)	at org.intellij.plugins.ceylon.ide.ceylonCode.model.IdeaCeylonProject.access$200(IdeaCeylonProject.ceylon:130)	at org.intellij.plugins.ceylon.ide.ceylonCode.model.IdeaCeylonProject$addModuleArchiveHook_$1.$call$(IdeaCeylonProject.ceylon:203)