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When attempting to import a solution in Dynamics 365, the solution import fails with the following error:
"Plug-in assembly does not contain the required types or assembly content cannot be updated.
Error code: 8004418b"
This error occurs if you have modified an assembly included in this solution but the version of the solution was not incremented.
Examples: Changing the name, version, isolation level, pubic key token, or culture of the assembly without increasing the version of the solution will cause this error. Changes like these require a solution upgrade (version change) instead of a solution update.
Increase the version of the solution and try the import again.
More Information
Update a custom workflow activity using assembly versioning
https://docs.microsoft.com/dynamics365/customer-engagement/developer/workflow/update-custom-workflow-activity-using-assembly-versioning
Release a new version of your managed solution
https://docs.microsoft.com/dynamics365/customer-engagement/developer/maintain-managed-solutions#release-a-new-version-of-your-managed-solution
Keywords: 8004418b, 0x8004418b, -2147204725, InvalidPluginAssemblyContent