error executing cmd usnig shell module in Python API | "Unexpected failure during module execution."

[Maged Motawea]

Hello,
I'm using Python API to deploy a Kubernetes cluster but I have an issue executing two commands using the shell module.
this is the first task's dictionary:

> {

>         'name': 'install flannel for pod network',

>         'action': {

>             'module': 'shell',

>             'args': 'kubectl apply -f {{ flannel_url }}'

>         },

>         'become': 'yes',

>         'become_user': 'kubeuser'

> }

where 'flannel_url': 'https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml'

and the second task:

> {

>         'name': 'join_cluster',

>         'action': {

>             'module': 'shell',

>             'args': '{{ join_command }}'

>         },

>         'become': 'yes'
> }

where 'join_command': 'kubeadm join 10.10.10.10:6443 --token ng0q9f.6qc6w82civ7o0m4l     --discovery-token-ca-cert-hash sha256:b6cd3a4509f61f95cc6b1ecaee5977d638d0cc7b319a863456ebb22266b9d1d9 '

I always get the following error message:

> An exception occurred during task execution. To see the full traceback, use -vvv. The error was: TypeError: expected string or bytes-like object fatal: [10.10.10.10]: FAILED! => {"msg": "Unexpected failure during module execution.", "stdout": ""}

I've tried setting the logl evel to DEBUG but there was no other information on these tasks.