I have tried to logout in offline mode but it shows the error popup.

Is it the feature of outsystem that we cannot login or logout in offline mode.

can you please share that what can I do/don't in online or in offline.

Hi Manish,

I think there is no built-in functionality for offline logout. 

We can do something like this.
Go to logout action in menu web block


please, I believe that you need look to this documentation:

Nuno Verdasca