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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util.HashMap$EntryIterator.next(HashMap.java:834) at java.util.HashMap$EntryIterator.next(HashMap.java:832) at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$1.next(Collections.java:1346) at java.util.Collections$UnmodifiableMap$UnmodifiableEntrySet$1.next(Collections.java:1339) at com.aptana.internal.index.core.DiskIndex.computeDocumentNames(DiskIndex.java:419) at com.aptana.internal.index.core.DiskIndex.mergeWith(DiskIndex.java:857) at com.aptana.index.core.Index.save(Index.java:611) at com.aptana.index.core.Index.save(Index.java:584) at com.aptana.index.core.IndexFilesOfProjectJob.run(IndexFilesOfProjectJob.java:81) at com.aptana.core.build.UnifiedBuilder.incrementalBuild(UnifiedBuilder.java:190) at com.aptana.core.build.UnifiedBuilder.build(UnifiedBuilder.java:140) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:629) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:172) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:203) at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:255) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:258) at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:311) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:343) at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144) at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:242) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)