Fishbum

I successfully cracked a wifi with backtrack 5r2 with reaver, this wifi in particular took alot longer than most to crack. the key that came up was very long, 6d788e9136fce5f98738617bce1a817eb4f4185f1bd31c726f4b99e45c5619 I copy and pasted the key when I try to connect the wifi it comes back, "Network Security Mismatch" Any ideas??? I tried the key on two computers and my mobile phone.. all come back the same with "Network Security Mismatch" Any advice greatly appreciated.. thanks in advance.