parameters: (self, node_def, op, message, error_code=UNKNOWN)
docstring: Creates an `UnknownError`.
docstring_summary: Creates an `UnknownError`.
docstring_tokens: Creates an UnknownError .
function: def __init__(self, node_def, op, message, error_code=UNKNOWN):
      """Creates an `UnknownError`."""
      super(UnknownError, self).__init__(node_def, op, message, error_code)
function_tokens: def __init__ ( self , node_def , op , message , error_code = UNKNOWN ) : super ( UnknownError , self ) . __init__ ( node_def , op , message , error_code )