Hmmm, super weird. Post processors are not written in XML and line 299 of the cps doesn’t look out of the ordinary. Can you do a Screencast showing your workflow (how you set up the operation and export the gcode)?
Alex (@MindOfMcClure) might have suggestions - I think he’s using Fusion and the pp.
In the mean time I’ll download the script and see if I get run into issues.