I tried to run a project in Xcode12/Swift4, while the project was written on Xcode8/Swift3
so I install Xcode version 11.7 and run this work for me.
AmMuhammadAhmad
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I do everything restarts Xcode, rebuild Project, adding toolChains, lock unlock them, but nothing works for me
so there are two possibilities
first, maybe you install the beta version of Xcode
or try this, this work for me->
I tried to run a project in Xcode12/Swift4, while the project was written on Xcode8/Swift3
so I install Xcode version 11.7 and run this work for me.
if you not done with 11.7 then install another version of Xcode and try the appreciated version
May this help you