Ansible error: The error was: 'dict object' has no attribute 'pkg_mgr'

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Hi, everyone:

I'm newbie with Ansible and their "Playbooks".

I try to solve some issues on a RHEL 8 through a "playbook", but I get this error:

The error was: 'dict object' has no attribute 'pkg_mgr'

Any clue will be appreciated.
Thank you,

JoséMi

user@DTK27-POR ~ % ansible-playbook -i .ansible/inventory/static-ini-inventory Downloads/www-playbook1-1639731408574.yml

PLAY [update vulnerable packages] **********************************************************************************************************

TASK [check for update] ********************************************************************************************************************
fatal: [web.serverxxxx.com]: FAILED! =>
  msg: |-
    The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'pkg_mgr'

    The error appears to be in '/Users/user/Downloads/www-playbook1-1639731408574.yml': line 48, column 7, but may
    be elsewhere in the file depending on the exact syntax problem.

    The offending line appears to be:

      tasks:
        - name: check for update
          ^ here

PLAY RECAP *********************************************************************************************************************************
web.serverxxxx.com      : ok=0    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0

user@DTK27-POR ~ %
JL

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