Problem registering account in PushBullet after watch hanged

Hello,
a few days ago I configured PushBullet on my smartphone and on my watch to get smartphone notifications on my watch, through wifi or 3g instead of bluetooth. Everything worked fine until today, even if I checked the settings on both devices. I tried to uninstall and reinstall the app on both device in order to do a fresh start, but during uninstallation the watch hanged and rebooted itself. After reboot I reinstalled the app, but when I select my google account I receive a message telling it cannot register my account (while it did it before, and on my smarpthone registration went well). If I login with another google account of mine, no errore occur, but I need to use my other account.
I beleive the problem is that unisntallation problem was interrupted by reboot, but other than uninstall and reinstall, what can I do? Is there a way to wipw data of an app, like on a smartphone?
Thamk you