Hi and sorry in advance for a repeat topic.  I just got minecraft last night at my friend's house and I'm trying to log in and I keep getting an error.  It doesn't say that my login failed or that my password is incorrect.  It just keeps returning "error"

Does anyone know what would cause this?  It's currently forcing me to play offline which means I can't use the server I JUST set up.  Please help!  Thanks!