I followed this article step by step, but when I go to execute the Functions, I get the following error:

An error occurred in the Microsoft .NET Framework while trying to load assembly id 65579. The server may be running out of resources, or the assembly may not be trusted with PERMISSION_SET = EXTERNAL_ACCESS or UNSAFE. Run the query again, or check documentation to see how to solve the assembly trust issues. The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)

I tried dropping Assembly and re-adding as UNSAFE, but I get the same error. Any ideas what I may be doing wrong?

p.s. running on Sql Svr 2012 instance