Question After I ran the model, and attach the results, nothing is available. I found the following message in the .F06 file: "USER FATAL MESSAGE 9050 (SEKRRS) ^^^ RUN TERMINATED DUE TO EXCESSIVE PIVOT RATIOS IN MATRIX KLL. ^^^ USER ACTION: CONSTRAIN MECHANISMS WITH SPCI OR SUPORTI ENTRIES OR SPECIFY PARAM,BAILOUT,-1 TO CONTINUE THE RUN WITH […]

Here is a simple video tutorial that explains how to do it:  https://www.youtube.com/watch?v=iQLyzD0WSRk?rel=0 In short: create a circle (curve) at the corner and use it to cut out the quarter hole.