You might be encountering a known issue that is a conflict between an AutoPLANT product and promis•e, which I believe has to be resolved in the AutoPLANT product. To test this (and also work around the conflict), try renaming the at_custui.arx file(s) before starting promis.e, then restore the original file name before starting AutoPLANT. Do not run promis•e and AutoPLANT simultaneously.
at_custui.arx can be found in paths such as:
"\Program Files\Bentley\Plant V8i\Bin\R16\"
"\Program Files\Bentley\Plant V8i\Bin\R17\"
This information is from an article in the Bentley KnowledgeBase.
If the test resolves the error messages, then I would recommend submitting a service ticket for the AutoPLANT product(s) involved to check on the status of the resolution of the conflict.