関連ワード:  attributeerror nonetype object has no attribute add_knows_career    attributeerror nonetype object has no attribute add    attributeerror nonetype object has no attribute add_callback    attributeerror nonetype object has no attribute address    attributeerror nonetype object has no attribute addwidget    attributeerror nonetype object has no attribute add_child    attributeerror nonetype object has no attribute addindicator    attributeerror nonetype object has no attribute add_node    attributeerror nonetype object has no attribute add_library    attributeerror nonetype object has no attribute add_done_callback  
結果 : attributeerror nonetype object has no attribute add