class_docstr: Raised when publishing of an event fails.
  
  Attributes:
      timestamp -- Unix timestamp of the event during which publishing fails.
docstr: Returns string representation of exception.
docstr_tok: ["Returns","string","representation","of","exception","."]
code: def __str__(self) -> Text:
      """Returns string representation of exception."""
      return str(self.timestamp)
  
imports: from typing import Text
  from packaging import version
  from dataclasses import dataclass
  from rasa.shared.exceptions import RasaException
  from rasa.constants import MINIMUM_COMPATIBLE_VERSION
label_desc: Use image node_id 1 for calling the PublishingError obj's underlying member method code with example usage: obj.__str__() and returns: str