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I'm fairly new to EA coding but i am completely stumpped here.... I have no errors in my code, no syntax errors, nothing. EA works as it should perfectly when i attach to a demo account forward testing. But it does nothing in the strategy tester ! I

Hi guys,  I'm trying to learn some mql4 coding to create my own EA's and im going through the online thing they have here and i am a bit confused on the following parts:       Symb = Symbol ()