I want to add new compute to my kolla ansible but i gave this error :

TASK [nova-cell : Get a list of existing cells] ******************************************************************************************************************
fatal: [R6SC15.cpaas.ir -> control01]: FAILED! => {"msg": "The conditional check 'existing_cells_list.rc != 0' failed. The error was: error while evaluating conditional (existing_cells_list.rc != 0): 'dict object' has no attribute 'rc'"}

can anyone help me whats the problem ?