class_docstr: An object that is referenced does not exist
class_docstr_tok: ["An","object","that","is","referenced","does","not","exist"]
code: def __str__(self) -> str:
      return f"{super().__str__()} because it reference to `{self.reference_name}` that doesn't exist"
  
imports: import logging
  import os
  import traceback
  from abc import ABCMeta, abstractmethod
  from pathlib import Path
  from typing import Any, Callable, Dict, List, Mapping, Type, Union
  import toml
  import yaml
label_desc: Use image node_id 2 for calling the UnknownReferenceError obj's underlying member method code with example usage: obj.__str__() and returns: super, str, self, str