We recently upgraded our client’s environment from CRM 4.0 to 2011. For the most part, the upgrade went smoothly during the in-place upgrade. But then we ran into a road block.
In that environment, we had several CRM 4.0 plugins that we modified and packaged in a solution. When we tried to import the solution into the client’s CRM 2011 environment, we received this error:
Failure 0×80044191 Unable to load plug-in assembly
Further, if we used the CRM 2011 plugin registration tool to register these CRM 4.0 assembly and steps, the same error, unable to load plug-in assembly, was thrown.
Turns out, we were missing the 32bit and 64bit CRM 4.0 SDK assemblies from the GAC.
If you need these assemblies, you can click here to download them.
Copy the dll’s from both the 32bit and 64bit to your c:\windows\assembly folder.
Now you should be able to import your CRM 4 solution and sdk message processing steps without issues.
