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error message - doubly nested contour

Question asked by Dean Viviani on Jul 8, 2007
Latest reply on Jun 4, 2008 by Bill Reuss
Does anybody know what a "doubly nested contour" is .? Is it something to do with sketch lines not joining, or maybe lines on top of lines ..? I have imported a sketch from Autocad and it is coming up with this error when creating a base flange from the sketch. The sketch also contains text & construction lines which I dont think is the problem.