code: def __init__(self, missing_variable):
      msg = f"Missing '{missing_variable}' in env configuration"
      super().__init__(msg)
  
imports: from neptune.common.exceptions import NeptuneException
label_desc: Use image node_id 1 to create a new MissingEnvironmentVariable object from inherited base classes: ConfigurationException with example: obj = MissingEnvironmentVariable(missing_variable)