"Your CD-Key is not valid" WTF??

[Sreejith]

Whenever i try to join a server Bf2 shows an error message - "Your CD-Key is not valid". I am playing BF2 for the past one month. I never got this error before. I am using a legit CD-Key. I dont use hacks/cheats or whatever. Then why is it showing this??

[jesus]

http://www.totalgamingnetwork.com/main/showthread.php?t=133047