I upgraded my iPad mini and now Facebook requires password that it will not except!

I upgraded my iPad mini and now Facebook will not open. Asks me to go to settings and insert password. Right password, but will still not work. In Hay Day the game has lost my friends that I have got via Facebook?? And i cant insert them because it requires me to go to settings and insert password. That it will not except!!! Why did I upgrade? it worked fine before. I dont want to reset my ipad that will lose all data...