Thanks.
v12.0.1 is the Homey firmware version 
The Homey app version is to be found @ mobile app, …More>Settings>General, below the header “App”
_
So now it’s CallMeBot whatsapp which errors as it seems:
Most apps have their own forum topic, as mentioned @ homey.app store app pages.
This is the dedicated CallMeBot app topic for howto’s, support and questions:
https://community.homey.app/t/app-pro-whatsapp-signal-telegram-facebook-messenger/48374
You’ll find instructions to setup whatsapp in the first post of that topic.
For the whatsapp app (v1.25.1) the dedicated app topic is (like Mike alr. mentioned):
My guess, you used the instructions from the Whatsapp app v1.25.1, to setup Callmebot whatsapp v1.5.1
These apps work very different
