Question: What could be causing this error? Undefined symbols for architecture x86_64: Date: : Date(), referenced from: Check: Check(Date, std::. 1::basic_string , int, double) in check-fb3b46.0
What could be causing this error?

Undefined symbols for architecture x86_64: "Date: : Date()", referenced from: Check: Check(Date, std::. 1::basic_string , int, double) in check-fb3b46.0 main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
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