What is checkpoint error on FB login?

Recently i could not login to my FB account it always say checkpoint error and says "Sorry, We'll get this fix as soon as we can" i also have another account which does not have any photos or nothing much its for emergency everyones else account seems to be working normally but mine i tried it with a different computer it wouldn't work its my account please help me to find a way to get this fix that account is FILLED with PHOTOS friends.. messages... comments... memory and etc..... if u think this is stupid carry on i dont rlly care but this account is really important i know its still there but i cant login to it Please help it would be a PLEASURE if u could help me.