22｜AI generates the most MQL errors

Introduction

AI can generate a lot of code.

However, in MetaTrader development, there are a lot of specific incorrect generations.

This is not a coincidence.

The overlap of information AI references, learned code, and MetaTrader-specific specifications leads to similar failures.

? Representative misgenerations

There are several typical MQL errors that AI tends to generate.

Misuse of OrderSend.

Use of MarketInfo.

Generation of start().

Generation of init().

Misuse of CopyBuffer.

Forgetting to release Indicator Handle.

Lack of ArraySetAsSeries.

Mixing MQL4 and MQL5.

Unused Trade class.

Lack of understanding of OnTick, OnInit, OnDeinit.

These are not merely syntax errors.

They arise from the AI not correctly understanding the generation across generations of MetaTrader, its design philosophy, and event-driven structure.

? Not a syntax error but a design error

The important point is that the AI is not merely making grammatical mistakes.

Rather, in many cases, the problem lies at the design stage.

Writing MQL5 with the mindset of MQL4.

Confusing the roles of indicators and EA.

Obtaining a Handle but not managing it.

Not understanding the assumptions behind obtaining buffers.

This is not just a misspelling.

It is a lack of architectural understanding.

? Why do the same mistakes occur

AI answers based on many existing code examples from the past.

There is a lot of old information about MetaTrader.

Code from the MQL4 era.

Old tutorials.

Samples that work but have an old design.

Because such information exists in large quantities, AI cannot always choose the latest, most accurate, and safest implementation.

As a result, misgeneration repeats.

? MAEP perspective

The biggest problem with AI is not its lack of code generation ability.

It is the lack of MetaTrader-specific design education.

The Error Database is a mechanism to visualize that lack.

✅Summary

The MQL errors most generated by AI are not grammar mistakes but a lack of design understanding.

That is precisely why we need to educate AI about MetaTrader.