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java.lang.IllegalArgumentException: 	at org.eclipse.core.internal.runtime.Assert.isLegal(Assert.java:58)	at org.eclipse.core.internal.runtime.Assert.isLegal(Assert.java:42)	at org.eclipse.core.runtime.Status.setMessage(Status.java:174)	at org.eclipse.core.runtime.Status.(Status.java:81)	at org.python.pydev.editor.actions.PyGoToDefinition.run(PyGoToDefinition.java:66)	at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:246)	at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:182)	at org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHandlerWrapper.java:108)	at org.eclipse.core.commands.Command.execute(Command.java:311)	at org.eclipse.core.commands.ParameterizedCommand.execute(ParameterizedCommand.java:396)	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:459)	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:781)	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:828)	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:550)	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:493)	at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:117)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)