class_docstr: Raised when a model is too old to be loaded.
  
  Args:
      model_version: the used model version that is not supported and triggered
          this exception
code: def __str__(self) -> Text:
      minimum_version = version.parse(MINIMUM_COMPATIBLE_VERSION)
      return (
          f"The model version is trained using Rasa Open Source {self.model_version} "
          f"and is not compatible with your current installation "
          f"which supports models build with Rasa Open Source {minimum_version} "
          f"or higher. "
          f"This means that you either need to retrain your model "
          f"or revert back to the Rasa version that trained the model "
          f"to ensure that the versions match up again."
      )
  
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 UnsupportedModelVersionError obj's underlying member method code with example usage: obj.__str__() and returns: str, self, str, minimum_version, str