Log into FileVault gives error on disk try again later. This is only account on system how do I log in to do disk repair. MacBook Pro running lion

Only have 1 account on MacBook Pro. Protected by FileVault. Log in says your home folder didn't open. It needs repaired. We click ok. Unable to login to account at this time. Account failed because error occurred. Everything I have read so far has me doing things from the finder but I can't get into the program. This happened after I did an update last night and it asked to restart system. I have it backed up on external drive through time machine but I can't get in to use it.