someone please help i got this probs while debug

1>main.obj : warning LNK4006: "struct sqlca sqlca" (?sqlca@@3U0@A) already defined in functions.obj; second definition ignored
1>functions.obj : error LNK2019: unresolved external symbol "void __cdecl sql_error(char *)" (?sql_error@@YAXPAD@Z) referenced in function "void __cdecl fnConnectDB(void)" (?fnConnectDB@@YAXXZ)
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