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    java.lang.ClassCastException: com.ge.research.sadl.external.ExternalEmfResource cannot be cast to org.eclipse.xtext.resource.XtextResource
        at org.eclipse.xtext.ide.server.WorkspaceManager.doRead(WorkspaceManager.java:278)
        at org.eclipse.xtext.ide.server.LanguageServerImpl.lambda$documentSymbol$35(LanguageServerImpl.java:609)
        at org.eclipse.xtext.ide.server.concurrent.ReadRequest.lambda$run$0(ReadRequest.java:37)