Failed to sync and login with Google

Google had recently changed the way apps communicate with their servers.
This is probably the reason you experience the sync failure.
The following procedure should resolve your issue immediately:
  • Open gTasks Settings -> Google Tasks Sync, and tap your email account at the top.
  • In the opened page, login with your Google account email and password.
When the login page close, ignore the red minus and any red error message. Just go back to your tasks list.

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