Please reload EA Studio with Ctrl + F5 and try.

But you are right. There are many users that don't reload EA Studio for weeks. So I changed the MQL to have requiredBars = 100 by default.

Please reload EA Studio with Ctrl + F5 and try.

Something like:

const int requiredBars = 100;

void OnTick()
{
    if ( ArraySize(Time) < requiredBars ) return;

    ...
}

requiredBars can be set from EA Studio on export depending on the strategy.

It's possible to overcome these "Array out of range" problems by starting the backtest 1 or 2 days later, but @Popov you know that "Array out of range" is not a problem from a backtest but from a source code and needs to be managed properly.

Like I told you, a possible solution is to put a simple condition before accessing to the actual array, like that:

datetime Time(int bar){
    if(bar >= ArraySize(Time)) return 0;
    return Time[bar];
}

instead of

datetime Time(int bar){
    return Time[bar];
}

Think about that, maybe for the next release.
Thank you @Popov

What is the purpose of importing data in MetaTrader?

The backtest on third party data may not correspond to the following real trading.

@Popov here a screenshot where I made a Print of the value of the ArraySize of Time and it shows also the number of Bars on the chart (that of course are equal to ArraySize(Time).

Please check if you have any data. Print the size of the data arrays.
Is it possible to require more bars than you have?

datetime Time(int bar){ if(bar >= ArraySize(Time)) return 0; return Time[bar];}
double Open(int bar){   if(bar >= ArraySize(Open)) return 0; return Open[bar];}
double High(int bar){    if(bar >= ArraySize(High))  return 0; return High[bar];}
double Low(int bar){     if(bar >= ArraySize(Low))   return 0; return Low[bar];}
double Close(int bar){   if(bar >= ArraySize(Close)) return 0; return Close[bar];}

@Popov I thinnk you can modify this code in the current MQL template, in order to fix this bug with that solution.

It must be something of how MT generates the ticks. Generally, you don't need to use "every tick" in MT with EA Studio experts. Please check if you have similar results when you use the "bar open" or the "control points" methods with EA Studio.

I tested an expert with Candle Color and it works fine.

Please upload your expert for further analysis. It can be another reason and we must find and fix it.

Hi,

i have now checked a little. It must be something with Open Prices Only test and Tick data test.

When i use Tickdata test than i get the out of range error when i use open prices only it is working.

But why it is ? Can you check . Here the Ea.  Use date from 02.01.2015 - 31.01.2020

Please upload your expert for further analysis. It can be another reason and we must find and fix it.