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java.util.ConcurrentModificationException at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1211) at java.util.TreeMap$KeyIterator.next(TreeMap.java:1265) at com.twitter.intellij.pants.service.project.modifier.PantsCyclicDependenciesModifier.modify(PantsCyclicDependenciesModifier.java:32) at com.twitter.intellij.pants.service.project.PantsResolver.addInfoTo(PantsResolver.java:83) at com.twitter.intellij.pants.service.project.PantsSystemProjectResolver.resolveUsingPantsGoal(PantsSystemProjectResolver.java:199) at com.twitter.intellij.pants.service.project.PantsSystemProjectResolver.resolveProjectInfoImpl(PantsSystemProjectResolver.java:139) at com.twitter.intellij.pants.service.project.PantsSystemProjectResolver.resolveProjectInfo(PantsSystemProjectResolver.java:75) at com.twitter.intellij.pants.service.project.PantsSystemProjectResolver.resolveProjectInfo(PantsSystemProjectResolver.java:53) at com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl.a(RemoteExternalSystemProjectResolverImpl.java:37) at com.intellij.openapi.externalSystem.service.remote.AbstractRemoteExternalSystemService.execute(AbstractRemoteExternalSystemService.java:59) at com.intellij.openapi.externalSystem.service.remote.RemoteExternalSystemProjectResolverImpl.resolveProjectInfo(RemoteExternalSystemProjectResolverImpl.java:37) at com.intellij.openapi.externalSystem.service.remote.wrapper.ExternalSystemProjectResolverWrapper.resolveProjectInfo(ExternalSystemProjectResolverWrapper.java:49) at com.intellij.openapi.externalSystem.service.internal.ExternalSystemResolveProjectTask.doExecute(ExternalSystemResolveProjectTask.java:51) at com.intellij.openapi.externalSystem.service.internal.AbstractExternalSystemTask.execute(AbstractExternalSystemTask.java:138) at com.intellij.openapi.externalSystem.service.internal.AbstractExternalSystemTask.execute(AbstractExternalSystemTask.java:124) at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$3.execute(ExternalSystemUtil.java:415) at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$5.run(ExternalSystemUtil.java:494) at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:635) at com.intellij.openapi.progress.impl.CoreProgressManager$3.run(CoreProgressManager.java:170) at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:494) at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:443) at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:155) at com.intellij.openapi.progress.impl.ProgressManagerImpl$1.run(ProgressManagerImpl.java:128) at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:308) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)