https://github.com/RallyTools/RallyRestToolkitForPython/blob/fc780ada9c5829dc39e315852aa9333bc4436c14/pyral/restapi.py#L1209 The line above has a typo in it, it currently is outliers = [item for item in item_types if item._type != item_type] It was presumably intended to be outliers = [item for item in item_types if item != item_type] Thanks! - D