Use this function to retrieve any error information that the remote service may have returned if an error has occurred on execution:
fgl_ws_error("handle", ["type"])
The optional type refers to the portion of the error message to receive; one of "code", "reason", or "detail". If no type is specified, "reason" is the default. If an incorrect handle is specified, or there has been no error, this function will return NULL:
CALL fgl_ws_error("myAdd", "code")