How do I sort out this array out of range error?

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  double closeh4x[];
   ArraySetAsSeries(closeh4x,true);
   CopyClose(_Symbol,PERIOD_H4,0,30,closeh4x);
    double close26h4x=closeh4x[26];
 //================

The error relates to the close price of the last 26th candle and states ' Array out of range' How do i fix this?

Documentation on MQL5: Constants, Enumerations and Structures / Indicator Constants / Price Constants
Documentation on MQL5: Constants, Enumerations and Structures / Indicator Constants / Price Constants
  • www.mql5.com
Calculations of technical indicators require price values and/or values of volumes, on which calculations will be performed. There are 7 predefined identifiers from the ENUM_APPLIED_PRICE enumeration, used to specify the desired price base for calculations. If a technical indicator uses for calculations price data, type of which is set by...
  
CopyClose(_Symbol,PERIOD_H4,0,30

  1. You asked for thirty (30) values. You didn't check if you got that many.

    Check your return codes, and report your errors. Don't look at GLE/LE unless you have an error. Don't just silence the compiler, it is trying to help you.
              What are Function return values ? How do I use them ? - MQL4 programming forum
              Common Errors in MQL4 Programs and How to Avoid Them - MQL4 Articles

  2. On MT4: Unless the current chart is that specific symbol(s)/TF(s) referenced, you must handle 4066/4073 errors before accessing candle/indicator values.
              Download history in MQL4 EA - Forex Calendar - MQL4 programming forum - Page 3 #26 № 4 2019.05.20

    On MT5: Unless the chart is that specific pair/TF, you must synchronize the terminal Data from the Server before accessing candle/indicator values.
              Is it mystical?! It is! - Withdraw - Technical Indicators - MQL5 programming forum 2019.05.31
              Timeseries and Indicators Access / Data Access - Reference on algorithmic/automated trading language for MetaTrader 5
              Synchronize Server Data with Terminal Data - Symbols - General - MQL5 programming forum
              SymbolInfoInteger doesn't work - Symbols - General - MQL5 programming forum 2019.09.03
              OnCalculate during weekend MT5 - General - MQL5 programming forum

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