Hello Chao,
I have never seen such a thing as well. You better ask your broker.
Also, make sure to ask them if they allow the auto-trading at all. The EAs are just as regular ones, nothing so special in them to cause issues. The code is a code.
There should be something with the broker or the Meta Trader that you have installed.
Have you used the same Meta Trader and broker for some of my other trading courses?