I have recently inherited a Beckhoff Twincat3 plc project, Build 4026.6, for a production machine. When I opened the archived Project (with custom libraries provided by the OEM) in Beckhoff XAE Shell, I discovered that the OEM archive has code changes that are not present in the running beckhoff plc. And when I tried to build the Archived OEM Project, I received 4 errors: (a) one C0077: Unknown type; (b) two C0032: Cannot convert type; and (c) one C0018: invalid assignment target. All errors are related to one of the OEM compiled libraries, pid_autotoune. I have pasted a screenshot of the errors here Twincat3 Compile Errors

Since this is my first time working with a beckhoff Twincat Project, I would appreciate any advice from experienced users who could help me resolve these issues, as I cannot edit the compiled libraries provided by the OEM. Once I can build the project and download to the plc, I will be ready to make plc code changes that are needed to address

Thank you very much, in advance for your help.

Terry