Solved: Method not found: ‘!!0[] System.Array.Empty()’.

If you are getting a message for your recently developed .Net application when you publish to the server to the effect of:

ssnetframeworkerror

Chances are the server you are deploying to does not have the appropriate framework to support your app.

Download the Microsoft .Net Framework 4.6.1 and install it to resolve this. It will likely require a server reboot to complete it so don’t do it on prod mid-day! Hope this helps, questions are welcome!