@classmethod
def load_smrff(cls, parsed_file, pfile_name=None, restrict=None):
    """
        Given a parameter file, inport the LJ parameters if possible.

        **Parameters**

            parsed_file: *str*
                A parsed smrff parameter file input string (no comments or
                trailing white spaces)
            pfile_name: *str*
                The name of a parameter file to be parsed.  If specified,
                then parsed_file is ignored (you may simply pass None as
                parsed_file).
            restrict: *list, str, optional*
                A list of atom labels to include when loading.  If not
                specified, everything is loaded.

        **Returns**

            obj: *list, ...*, or *None*
                Returns a list of objects if possible, else None.
        """
    raise Exception(
        'Error - load_smrff not implemented for general Connector object.')
