def is_err(self) -> IsErrRequestBuilder:
        """
        Provides operations to call the isErr method.
        """
        from .is_err.is_err_request_builder import IsErrRequestBuilder

        return IsErrRequestBuilder(self.request_adapter, self.path_parameters)

        Provides operations to call the isErr method.
        
msgraph/generated/drives/item/items/item/workbook/functions/functions_request_builder.py