MT5 Strategy Tester Error

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Hello there. I am trying to use the MT5 strategy tester since last year but it does not work. I noticed this after MT5 update at the end of 2023/ early 2024. Since then I have tried different machines, diferrent OS (Win 11/ Win10), different broker. It just does not work. The Core 01 disconnected as soon as the history is synchronized. But on the visual mode log, it says history synchronization apply error, data load error, please make sure history is available on the trade server.

Any solution?

terminal visual mode log
 

Confirmed and reported to MQ attention.

In the meantime you can downgrade to build 5430.

Forum on trading, automated trading systems and testing trading strategies

All about MT5 updates.

Alain Verleyen, 2025.12.16 22:54

In case you got an BETA update, for whatever reason, and you want to move to the last official release :

  • A Telegram channel has been created, you will always find there the last official release needed exe files.
  • MT5 Terminal is available in several versions according to your CPU capabilities. You can check which version you have to use in the Journal log, at the first entries after you started MT5.

Here my version is AVX2, an other possibility is X64

  • With this information you will know which zip file to download.


  • You then just have to replace your current exe files with the ones from the Zip. If you don't know how to do, then doing this operation is probably not a good idea.

After MT5 is restarted, you will have the last official release.

If you don't want to get beta-build updates again :

  • NEVER connect to MetaQuotes-Demo server.
  • NEVER use MT5 Terminal Help menu=>Check for Updates=>Last Beta Version.

 
Alain Verleyen #:

Confirmed and reported to MQ attention.

In the meantime you can downgrade to build 5430.


Thank you. It works!
 

I am having similar troubles, but can't seem to even backtest on a stock example EA using platform / broker data.  

The error i  keep getting is something like: Agent-127.0.0.1-3000\..\bases\Darwinex-Demo\history\EURUSD\2019.hcs open error [3].

MT5 backtester not loading data for backtests - Easy Trading Strategy - General - MQL5 programming forum

MT5 backtester not loading data for backtests
MT5 backtester not loading data for backtests
  • 2026.01.19
  • www.mql5.com
Hello, I am experiencing a deterministic Strategy Tester failure in MT5 build 5506...
 
The same issue with me. Issue happened after last update,etc.
 
Jarrod Holmes #:

I am having similar troubles, but can't seem to even backtest on a stock example EA using platform / broker data.  

The error i  keep getting is something like: Agent-127.0.0.1-3000\..\bases\Darwinex-Demo\history\EURUSD\2019.hcs open error [3].

MT5 backtester not loading data for backtests - Easy Trading Strategy - General - MQL5 programming forum

Forum on trading, automated trading systems and testing trading strategies

MT5 backtester not loading data for backtests

Alain Verleyen, 2026.01.19 14:08

Known bug with current beta. a fix will certainly by provided soon.

The last official release is 5430.



 

Forum on trading, automated trading systems and testing trading strategies

All about MT5 updates.

Alain Verleyen, 2025.12.16 22:54

In case you got an BETA update, for whatever reason, and you want to move to the last official release :

  • A Telegram channel has been created, you will always find there the last official release needed exe files.
  • MT5 Terminal is available in several versions according to your CPU capabilities. You can check which version you have to use in the Journal log, at the first entries after you started MT5.

Here my version is AVX2, an other possibility is X64

  • With this information you will know which zip file to download.


  • You then just have to replace your current exe files with the ones from the Zip. If you don't know how to do, then doing this operation is probably not a good idea.

After MT5 is restarted, you will have the last official release.

If you don't want to get beta-build updates again :

  • NEVER connect to MetaQuotes-Demo server.
  • NEVER use MT5 Terminal Help menu=>Check for Updates=>Last Beta Version.

 

I just spent about 9 hours and finally got mine working -

MT5 terminal and MT5 tester do not share history- MT5 fails to auto-create .hcc inside the tester

If these folders do not exist, create them: My broker/currency/filenames may differ from yours -change accordingly;

C:\Users\YOUR USERNAME HERE\AppData\Roaming\MetaQuotes\Tester\REALLY LONG FILE NAME\bases\BlackBullMarkets-Demo\history\EURUSD

COPY the history files from;

Terminal\REALLY LONG FILE NAME\bases\BlackBullMarkets-Demo\history\EURUSD\

Copy ALL *.hcc  files
Paste them into the folder you created;

Tester\...\bases\BlackBullMarkets-Demo\history\EURUSD\

Start MT5

Hope than helps.

 

the problem is "Agent-127.0.0.1-3000\..\bases" should be " Agent-127.0.0.1-3000\..\..\bases"

temporary fix awaiting update is

copy folder C:\Program Files\MetaTrader 5\Bases

to C:\Program Files\MetaTrader 5\Tester\

a new folder C:\Program Files\MetaTrader 5\Tester\Bases will fix that..

remember update history data first, so file in tester use updated data.

 
Mohd Baba Mok:
Hello there. I am trying to use the MT5 strategy tester since last year but it does not work. I noticed this after MT5 update at the end of 2023/ early 2024. Since then I have tried different machines, diferrent OS (Win 11/ Win10), different broker. It just does not work. The Core 01 disconnected as soon as the history is synchronized. But on the visual mode log, it says history synchronization apply error, data load error, please make sure history is available on the trade server.

Any solution?

im having the same problem even tried restarting windows have no clue what is happening it work fine on my laptop but i bought a proper pc to test on but wont work on my proper pc
 
Alain Verleyen #:

Confirmed and reported to MQ attention.

In the meantime you can downgrade to build 5430.


This worked thank you so much dude the last 2 days i have tried everything 
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