when I try to reconfigure nova with kolla ansible this error will be shown :

TASK [nova-cell : Waiting for nova-compute services to register themselves] *******************************************************************************************
task path: /usr/local/share/kolla-ansible/ansible/roles/nova-cell/tasks/wait_discover_computes.yml:8
fatal: [control01 -> {{ groups[nova_cell_conductor_group][0] }}]: FAILED! => {
    "msg": "The conditional check 'inventory_hostname == all_computes_in_batch[0]' failed. The error was: error while evaluating conditional (inventory_hostname == all_computes_in_batch[0]): 'all_computes_in_batch' is undefined\n\nThe error appears to be in '/usr/local/share/kolla-ansible/ansible/roles/nova-cell/tasks/wait_discover_computes.yml': line 8, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n- block:\n    - name: Waiting for nova-compute services to register themselves\n      ^ here\n"

Does anyone have any idea what I should do ?