Error LED @ IFC

Hi guys, I want to recall back my experience in ROBOCON 2010. That is first time our team pass the round robin level
Then tomorrow we setup our robot, the error LED turns ON make the manual robot cannot move
We don't modify any programming, and robot working well the whole yesterday. We decide to remove all cards and stack again like we do before when we face the same problem, then the error LED OFF and robot OK
But, when we want go to the game, the same problem happen. Sometime error LED turn ON and sometime turn OFF
We don't know what is actually happen...
What is actually happen when error LED turns ON?




We don't know what is actually happen...

What is actually happen when error LED turns ON?