*ISSUE* Forge Mod loader has found ID mismatches

[Ireh_Muete]

So whenever I try to join my friend's server it says that "Forge Mod loader has found ID mismatches"
here's a pic of the error message. As of which log file it's talking about, I have no clue.

 

 

 

 

 

Any help is appreciated.

thanks

 

--------------------EDIT--------------------

It might also be worth mentioning that I'm in version 1.0.8, and so is the server that I'm trying to join.

Edited March 6, 2014 by Ireh_Muete