@lonnie I did a search here and there were others getting error 33 from ugs using files created in Carveco. One user said that he contacted Carveco and they sent him a new post processor. There is something about the number of decimal places carveco uses in the standard grbl in post processor. You may want to contact carveco.
Here is the thread. Aaxiscnc got the postprocessor. You could reach out to him to see if he would send you a copy.