# skfolio.exceptions.FactorNotFoundError ### *exception* skfolio.exceptions.FactorNotFoundError Factor name not found in factor_groups or loading_matrix not provided. #### add_note(object, /) Exception.add_note(note) – add a note to the exception #### with_traceback(object, /) Exception.with_traceback(tb) – set self._\_traceback_\_ to tb and return self.