Trying to archive to a .ipa fails...

I am trying to archive my app as an .ipa to upload to TestFlight, and I get an error saying:

Code Block 
Command CompileSwift failed with a nonzero exit code

this error is that same for my watch app and widget...

If I click into the error, it says that there is no error: imgur.com/a/O0yJDKg

any help appreciated!