Are you using an EA? As trade is not allowed (Error 4109) is usually an error presented when an EA doesn't have live trading enabled. Do you have a happy or sad face? If it's sad, double click it, and click the box for live trading. Then ok out of the dialog.
ovetus:
I cant trade USD MXN on the MT4 Trading Not allowed WHY ? On MT5 yes you can trade it
Why did you post your MT4 question in the MT5 General section (a miscellaneous catch-all category) instead of the MQL4 section, (bottom of the Root page)?
General rules and best pratices of the Forum. - General - MQL5 programming forum? (2017)
Next time, post in the correct place. I have moved this thread.
Did you ask your broker? they are always your first point of contact.
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Why did you post your MT4 question in the MT5 General section (a miscellaneous catch-all category) instead of the MQL4 section, (bottom of the Root page)?
General rules and best pratices of the Forum. - General - MQL5 programming forum? (2017)
Next time, post in the correct place. I have moved this thread.