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When back-testing an expert advisor in MT4 Strategy Tester it is sometimes possible to encounter an error that significantly spoils the quality of testing:

TestGenerator: unmatched data error (aaa value xxx.xxx at some.date and price yyy.yyy mismatched)

where aaa is either “high” or ”low”, xxx.xxx — some price rate and yyy.yyy …

OrderSend Error 4107 is a so-called MQL4 run-time error that is similar to OrderSend Error 129 but, unlike the latter, appears only during backtesting of the MT4 expert advisors, not during their live or demo run. The error is called ERR_INVALID_PRICE_PARAM (Invalid price) in the MT4 …

Build 381 that was released by MetaQuotes for MetaTrader 5 yesterday had many useful changes, but it also messed up with the standard libraries, rendering some of the working expert advisors useless. The problem still remains as of build 384 and probably won’t be fixed in the next builds.

The change …

Sometimes, especially during backtesting or in case of a badly designed expert advisor, the OrderSend Error 134 (or ERR_NOT_ENOUGH_MONEY) appears in the Journal log of your MetaTrader platform. In MT5 this error is called TRADE_RETCODE_NO_MONEY and has a code 10019. The reason for this error is the same for both versions of the platform — lack of free margin to execute …

OrderSend Error 138 (or ERR_REQUOTE) may appear during the execution (but not backtesting) of the MetaTrader expert advisors (only in MT4, as the MetaTrader 5 platform uses a different system of OrderSend error codes). Error 138 means that the broker replied with a ”Requote” signal to your expert advisor’s OrderSend function. …

OrderSend Error 148 or ERR_TRADE_TOO_MANY_ORDERS can be a rather frequent MetaTrader 4 error message, especially if you are trading on some demo/real contest account. The error means that you are trying to place an order or open a position when the maximum amount has already been reached. Some Fore …

Sometimes you would get an OrderSend Error 3 message in your experts log in MetaTrader 4. This can be a rather frustrating error because it prevents the order from executing (and position from opening). If you are an MQL coder you should learn how to fix it because …

After the latest update of the MetaTrader 5 terminal beta (to build 228) the new error appeared in the newly recompiled expert advisors. When adding an EA to a chart an ”Unresolved Function” error is displayed in the Experts output tab and the EA isn’t attached (even the input parameters dialog doesn’t appear):

The error appears only …

When using some MT4 expert advisors you may have encountered a rather annoying error message, which reads «OrderSend Error 129». This error should be avoided during EA’s creation, but even if you aren’t the author of the problematic EA, this error is rather easy to fix. OrderSend Error 129 in MetaTrader platform is internally called …

The expert advisors that work on one broker can stop working on another; the problem with them often lies in OrderSend Error 130. If you see Error 130 in the Log of your MetaTrader platform when your expert advisor should be opening a position, then that means that the stop-loss or take-profit levels are …