unresolved external symbol 'symbol' referenced in function 'function' The compiled code for function makes a reference or call to symbol, but the linker can't find the symbol definition in any of the libraries or object files. This error message is followed by fatal error LNK1120. To fix error LNK1120, you must fix all LNK2001 and LNK2019 errors first. Possible causes There are many ways to get th