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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)