class_docstr: Base Ax exception.
  
  All exceptions derived from AxError need to define a custom error message.
  Additionally, exceptions can define a hint property that provides additional
  guidance as to how to remedy the error.
code: def __str__(self) -> str:
      return " ".join(
          [self.message, getattr(self, "hint", "")]
      ).rstrip()
  
label_desc: Use image node_id 2 for calling the AxError obj's underlying member method code with example usage: obj.__str__() and returns: str