Hello Liu12,
sometimes we show those states when we're releasing a new version so we need users to sign in again.
Can you please tell me more? You can't sign in to sync service now?
Also please try:
1. Reset the sync - secure://settings/resetSync. Please back up your bookmarks (just to be sure) and reset the sync. Try to sign in to sync afterwards.
2. Try to Sign out and sign in again in secure://settings/syncSetup page.
Sorry for the inconvenience!