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The following problem was reported via the automated error reporting: Message: internal_error java.lang.ClassCastException: org.eclipse.emf.common.util.BasicEList$UnmodifiableEList cannot be cast to org.eclipse.ocl.cst.CSTNode at org.eclipse.m2m.internal.qvt.oml.cst.completion.parser.LightweightParser.parser(LightweightParser.java:327) at org.eclipse.m2m.internal.qvt.oml.cst.completion.parser.LightweightParser.parser(LightweightParser.java:314) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.LightweightParserUtil$RunnableLightweightParser.runParser(LightweightParserUtil.java:420) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.LightweightParserUtil$RunnableLightweightParser.runParser(LightweightParserUtil.java:1) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.LightweightParserUtil.parse(LightweightParserUtil.java:303) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.LightweightParserUtil.parse(LightweightParserUtil.java:288) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.LightweightParserUtil.getOclExpressionCS(LightweightParserUtil.java:251) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.LightweightParserUtil.getOclExpressionCS(LightweightParserUtil.java:312) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.LightweightParserUtil.getOclExpression(LightweightParserUtil.java:223) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.collectors.AbstractCallExpSourceCollector.getCallExpSource(AbstractCallExpSourceCollector.java:72) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.collectors.AccessorCollector.getCallExpSource(AccessorCollector.java:42) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.collectors.AbstractCallExpSourceCollector.isApplicableInternal(AbstractCallExpSourceCollector.java:43) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.collectors.AbstractCollector.isApplicable(AbstractCollector.java:25) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.QvtCompletionProcessor.updateCategoryIndex(QvtCompletionProcessor.java:164) at org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.QvtCompletionProcessor.computeCompletionProposals(QvtCompletionProcessor.java:122) at org.eclipse.jface.text.contentassist.ContentAssistant$5.run(ContentAssistant.java:1904) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1902) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:573) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:570) at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:505) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:499) at org.eclipse.jface.text.contentassist.ContentAssistant$2.run(ContentAssistant.java:384) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4024) Bundles: | org.eclipse.core.runtime | 3.11.1.v20150903-1804 | 3.11.1.v20150903-1804 | | org.eclipse.jface.text | 3.10.0.v20150603-1752 | 3.10.0.v20150603-1752 | | org.eclipse.m2m.qvt.oml | 3.5.0.v20150603-1058 | 3.5.0.v20150603-1058 | | org.eclipse.m2m.qvt.oml.editor.ui | 3.5.0.v20150603-1058 | 3.5.0.v20150603-1058 | | org.eclipse.swt | 3.104.2.v20160212-1350 | 3.104.2.v20160212-1350 | Operating Systems: | MacOSX | 10.11.4 | 10.11.4 | The above information is a snapshot of the collected data. Visit https://dev.eclipse.org/recommenders/committers/aeri/v2/#!/problems/5717fd81e4b0098b5504fc6a for the latest data. Thank you for your assistance. Your friendly error-reports-inbox.