Doing a little research i found out what is happening. Turns out that the project that I wanted was displaying the error "Module compiled with Swift 5.5.2 cannot be imported by the Swift 5.6 compiler" - different than the question that I made.
Here's what I did:
1 - Download the Swift 5.5.2 toolchain
https://www.swift.org/download/
2 - Install the file
3 - With the project opened, I clicked Xcode -> Toolchains -> selected the one that I wanted. Cleaned the project and built again, it worked fine.
debora_lage
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