Update Duplicati gets netstandard error

Hi there, I just updated to duplicati, from I think whatever the previous version was as I clicked to update once I saw the popup. After doing so, everytime I run a backup it would get through then error out at the very end giving:
Could not load file or assembly ‘netstandard, Version=, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51’ or one of its dependencies.

Any suggestions on how to fix this? This is a linux system

Maybe an outdated Mono version ? run mono --version