Disable Assembly Validation

If you ever get an error that looks like this, disable the Assemble Version Validation in Project Settings > Player > Other Settings.

Assembly 'Assets/Convai/Plugins/Grpc.Core.Api/lib/net45/Grpc.Core.Api.dll' will not be loaded due to errors: 
Grpc.Core.Api references strong named System.Memory Assembly references: 4.0.1.1 Found in project: 4.0.1.2.

Ensure that Assembly Validation is disabled in Project Settings > Player > Other Settings.

Restart the Unity project after unchecking the box should fix the issue.