public boolean hasErrors() {
		IXtextDocument xtextDocument = sourceViewerHandle.getDocument();
		return (xtextDocument.readOnly(new IUnitOfWork<Boolean, XtextResource>() {
			public Boolean exec(XtextResource state) throws Exception {
				IParseResult parseResult = state.getParseResult();
				return !state.getErrors().isEmpty() || parseResult == null;
			}
		}));
	}