class_docstr: Raised when an operation failed reason is unknown.
docstr: Creates an `UnknownError`.
docstr_tok: ["Creates","an","`","UnknownError","`","."]
code: def __init__(self, message, error_code=UNKNOWN):
      """Creates an `UnknownError`."""
      super(UnknownError, self).__init__(message, error_code)
  
imports: from absl import logging
label_desc: Use image node_id 1 to create a new UnknownError object from inherited base classes: StatusError with example: obj = UnknownError(message, error_code)