parameter conversion not allowed

How can I solve this error I get when I try to compilte my code containing:

the error is for this line:  (error says: parameter conversion not allowed)

int handle = FindWindowA(i, log);

int FindIfDirOpened() {
    string log = "logs";
    string i;
    
    int handle = FindWindowA(i, log);

    return(handle);
}