Found a fix for the "Data unstable" Error

So,A Friend of mine said that this error usually gets up after 6-7 seconds when the log page comes.

Just enter ur username and password in less than 6 seconds

if its hard to write both in less than 6 seconds, Just tick the "Save username" Box and then reopen the game
Then write your password when its still loading(Before the log in page comes in) then keep pressing "Enter" and you will be taken to the server page.

hope i helped