Error message "Unable to load plug-in type"

Hi I used plugin registration tool and updated an existing plugin by a new dll.. and then afer that I started recieveing error messages on the CRM on our Dev environment. Error message "Unable to load plug-in type" it was registered for contact entity for
post create and update but we are getting this error on any entity updates and creates..
Any help on how to resolve this issue with be deeply appreciated.
thanks in advance,
Future MVP

While this thread is 3 years old, yet I just encountered the same problem about half an hour ago, and I believe this is a bug within CRM Solution Import routine.
What I had was a plugin which was imported previously. Then, I added new plugin steps and got 'Unable to load plugin type' when registering the new plugin steps I added.
The solution I have is:
a. Import just the plugin assembly without the new plugin steps, and publish.
b. The plugin assembly is now updated with the new plugin class definition. Then add the new plugin steps and import the solution again.
c. The solution should now be imported successfully.
What I believe the bug is CRM Solution Import routine checks for the plugin class/type definition in the existing plugin assembly in the server rather than the new plugin assembly in the solution being imported.
By the way, all solutions are unmanaged. Perhaps, the same bug will not happen in Managed solution.
HTH anyone else experiencing the same issue.
Henri

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