PlansXpress has stopped working correctly, with error codes referring to .net and no drawing page in the software.
Update PlansXpress to latest edition (126.96.36.1993).
If you have recently updated to Parallels 16 and PlansXpress has stopped working correctly then the recommended course of action is to update PlansXpress to the latest Edition, version 188.8.131.523 or above.
Older editions without support will need to roll back to Parallels 15, as per Parallels support recommendation for similar issues:
Any questions, please contact support on 0117 916 7899.