In general, I look at the error numbers and if I have a -9 I know I have to reset my AutoCAD and CADWorx so I save the drawing, exit AutoCAD and restart the drawing and most of the time I can resolve the problem. I have found that a -9 error cannot be resolved without exiting AutoCAD. This is not the solution to the error, but without this step I usually cannot find the solution.
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Clark R. Johnson
Enerflex