[Still_in_jail]

Was just trying to jailbreak my iphone 3G running 4.2.1 with Greepoison 1.0 RC 6.1

I think I interrupted the process the first time by closing the program when I thought it wasn't working.

Now when I go through the steps of holding the buttons it just finishes that and says "Try Again".

Can anyone help?? Thank you in advance!