java.lang.RuntimeException: Unable to generate ast.

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java.lang.RuntimeException: Unable to generate ast.
at com.python.pydev.analysis.additionalinfo.builders.InterpreterObserver.restoreInfoForModuleManager(InterpreterObserver.java:164)
at com.python.pydev.analysis.additionalinfo.builders.InterpreterObserver.notifyDefaultPythonpathRestored(InterpreterObserver.java:56)
at org.python.pydev.ui.interpreters.AbstractInterpreterManager.restorePythopathFor(AbstractInterpreterManager.java:429)
at org.python.pydev.ui.pythonpathconf.PythonInterpreterPreferencesPage.doRestore(PythonInterpreterPreferencesPage.java:42)
at org.python.pydev.ui.pythonpathconf.AbstractInterpreterPreferencesPage$1.run(AbstractInterpreterPreferencesPage.java:171)

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