Hundreds of Errors when clicking on unity window, crashes on play

Yesterday I transferred my 2D game project form my mac to my PC and updated it to Unity 2019.3.0a5, and worked on it all day with no problem. When I opened it today it was flooded with errors. Whenever I switch between another window and Unity I get 365 errors with similar messages. I can clear these errors, so they don’t seem to affect my game, but when I press play Unity crashes and I can’t tell if it’s related.

I need to have this game finished by the end of the week so any help would be greatly appreciated.

Delete Temp, obj, Library and Packages.