This forum entry refers to the problem and sugests a solution.

https://cambamcnc.com/forum/index.ph...sg6459#msg6459

To change the post-processor click on the 'system' tab, and select the correct post-processor from the list in there. If this doesn't work then try a search on the CamBam forum. Copy and paste the error message into the search box. There are plenty of results to choose from!