Unity after update won't let me build my game

Here’s the problem in console:

You have this problem when one of your scripts / Prefabs / texture / material / model … has an error.
Eg.
You have a script and not something dopisałeś, if you do not want to have a mistake you need to add.
Now do you understand?

With you one file in 2 locations.
remove it from one place and you will not have an error.

I’m glad I could help you @kyrcooler

Sorry for my English but I had to use:
Google Transleter