Error log b is an undeclared identifier..., C++ (vc++)

Error log b is an undeclared identifier...

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Compilation time: 1,5 sec, absolute service time: 1,53 sec

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Error(s):

source_file.cpp(16): error C2065: '�?oa': undeclared identifier
source_file.cpp(16): error C2065: '�?o': undeclared identifier
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

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