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java.util.ConcurrentModificationException: null at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:711) at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:734) at org.eclipse.cdt.internal.core.pdom.CModelListener.addLastRecentlyUsed(CModelListener.java:135) at org.eclipse.cdt.internal.core.pdom.CModelListener.elementChanged(CModelListener.java:65) at org.eclipse.cdt.internal.core.model.CModelManager$2.run(CModelManager.java:1163) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.cdt.internal.core.model.CModelManager.notifyListeners(CModelManager.java:1154) at org.eclipse.cdt.internal.core.model.CModelManager.firePostChangeDelta(CModelManager.java:1110) at org.eclipse.cdt.internal.core.model.CModelManager.fire(CModelManager.java:1075) at org.eclipse.cdt.internal.core.model.CModelManager.fire(CModelManager.java:1032) at org.eclipse.cdt.internal.core.model.CModelOperation.run(CModelOperation.java:615) at org.eclipse.cdt.internal.core.model.CModelOperation.runOperation(CModelOperation.java:635) at org.eclipse.cdt.internal.core.model.BinaryRunner$1.run(BinaryRunner.java:126) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)