In order to support ipadmini6, Xcode was upgraded to 13.1, but
ld: Assertion failed: (memberIndex != 0), function makeObjectFileForMember, file archive_file.cpp, line 387. clang: error: linker command failed with exit code 1 (use -v to see invocation)
clean
clean build folder
Build Setting --> Enable Bitcode No；
Build Setting --> Architectures --> Build Active Architecture Only No；
Are invalid
As this pertains to a Unity framework, you're best option is to discuss this with their support.