SDL_ttf
TTF_GetError
char *TTF_GetError()
This is the same as SDL_GetError, which returns the last error set as a string which you may use to tell the user what happened when an error status has been returned from an SDL_ttf function call.
Returns: a char pointer (string) containing a human readable version or the reason for the last error that occured.
printf("Oh My Goodness, an error : %s", TTF_GetError());