Hi Vivianmak, do you mean that your EA works with other brokers but with this particular broker’s MT4, it shows you error 133? Did you try to restart the EA or the platform? Perhaps you could contact the EA developer or the broker’s tech support to check if they have any restriction settings for certain types of EAs. Usually these errors are caused by some specific settings of the broker so you better check. Alternatively the restart should make the error disappear.