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MetaTrader 5 runtime error code

MetaTrader 5 runtime error code: ERR_CUSTOM_SYMBOL_SELECTED (5306)

The error, as text you can copy

ERR_CUSTOM_SYMBOL_SELECTED
Code number
5306
Kind
Runtime error code
Where you meet it
Raised inside the platform's own language
API
MetaTrader 5 (Python package and MQL5)

What does ERR_CUSTOM_SYMBOL_SELECTED (5306) mean on the MetaTrader 5 API?

"You are trying to delete a custom symbol selected in Market Watch" is MetaQuotes' whole description of this code. It is an MQL5 runtime error code, returned by GetLastError(). The vendor lists it under the heading "Custom Symbols".

Risk warning: CFDs and spread bets are complex instruments and come with a high risk of losing money rapidly due to leverage. You can lose money on these products, and each provider publishes its own loss figure under FCA rules. You should consider whether you understand how they work and whether you can afford to take the high risk of losing your money. Automated and API trading can amplify losses through bugs, connectivity failures and runaway orders.

Independent and unofficialmql5.comchecked

How do I fix ERR_CUSTOM_SYMBOL_SELECTED (5306)?

Remove the symbol from Market Watch before deleting it. The vendor's page gives no further remedy.