i Can't Join

*Hello!

I have a problem when I want to open MineCraft and log in with LabyMod (my original account - not an original account) doesn't working I don't know why.
when i Log in without labymod it's working why? It's like this last week and i want to play with my friends i can't!
please response is quick.
Greetings:Waad Salman*