Anyway yesterday it was fine and the login issue started after the last update.
Thank you for the quick feedback!
Does it happen when you press "Logout" in the menu or when you hit the "back key" on the phone?
It happened after i downloaded the last update.
Today i deleted and reinstalled it, logged in and then i used the back button to exit the app but it logged me out and i got again the error.
Will try to login and logout manually.
edit.
So...if i use "logou" from the menu everything is fine.
If i use "back key" or i close the app from the "app manager" i get the error.