I want to insert an elliptical cam in to a circle by 2-dimensinal FEM. So I split the cam into two pieces, set the cams to be rigid bodies. To simulate the assemble process, I move the two pieces towards each other for 1mm, and have them move back in the analysis step.

However, I want to modify the profile of the cam, so that the profile is not a common geometry element. Therefore, I should've used equation curve, but abaqus does not support this funcion. so I used secondary development, using a series of short lines to approach the profile.

Other settings are shown below.

Unfortunately, the job is aborted due to one of the most trick errors. How can I improve the model to make it work?