Could not build module 'xxxxx'

I have a Swift project in Xcode and I'm working with Firebase and cocoapods. When I build my project, I get 15+ errors. All of them are "Could not build module 'xxxx' and the 'xxxx' are things like CoreFoundation, ObjectiveC, os_object, CoreGraphics, etc.

I've deleted derived data, restarted Xcode, reinstalled pods, my deployments are all matching (even in my pod targets). I'm absolutely out of ideas.

Can anybody point me in the right direction?

Could not build module 'xxxxx'
 
 
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