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Solved – System.ArgumentNullException: Value cannot be null.Parameter name: SandboxAppDomainHelper.Execute: The plug-in type could not be found in the plug-in assembly in Dynamics 365
We got the below error while in one of our plugin assemblies. As it turned out we were referencing the latest, version 9 Dynamics 365 assemblies in our plugin project, against our Dynamics 365 Env…