Free learning tools Test your finance and trading knowledge before you build, buy, or automate.
Finance Calculation Quiz Forex Trading Quiz
FREE MQL4 DEBUGGER - NO LOGIN - BUILT FOR CHATGPT EA ERRORS

MT4 EA Compile Error Explainer

Paste MetaEditor errors or MQ4 source code. The tool identifies common MQL4 compile errors, MT4 trade errors, risky EA patterns, likely causes, exact repair steps and safer code snippets before you waste hours guessing.

Paste MT4 Error Log Or MQ4 Code

Best input: copy the first 5 to 15 MetaEditor errors with line numbers. You may also paste code for risk checks.

Send EA For Manual Repair

Professional MT4 Repair Workflow

Copy first errors Fix the first true compiler error first. Later errors often disappear after one syntax or scope repair.
Separate MQL4 from MQL5 Remove CTrade, PositionGet and CopyBuffer style logic from MQ4 files before deeper debugging.
Validate broker rules Check digits, point size, stop level, lot step, min lot, max lot and spread before sending orders.
Protect live accounts Add MagicNumber, spread filter, slippage control, daily loss stop and one-trade-per-signal logic.
Compile after every module Recompile after each repaired block so the exact breaking change is known.
Backtest then forward test After compile success, run visual backtest and a demo forward test before any live deployment.

Common MQL4 Errors This Tool Explains

undeclared identifierwrong parameters countsemicolon expectedunexpected token not all control paths return a valuepossible loss of datacannot convert enumarray out of range OrderSend error 130OrderSend error 131invalid price 4107MQL5 code inside MT4 EA

Need The EA Fixed Properly?

The tool gives the likely repair path. For full source repair, AlgoSpecial can clean the compile errors, remove MQL5/MQL4 conflicts, add risk filters and return a compile-ready MQ4 file.

MT4 EA Developer Service Expert Advisor Development Free MT4 EA Builder

FAQ

Can this tool fix ChatGPT MT4 EA errors?

Yes. It is especially useful for ChatGPT-generated EAs because many failures come from mixed MQL4/MQL5 syntax, missing declarations, wrong OrderSend parameters and unsafe broker-rule handling.

Does it compile my MQ4 file on the server?

No. It explains errors from pasted text and code patterns. Real compilation still requires MetaEditor on Windows because MetaQuotes does not provide a normal public web compiler for MT4.

Can AlgoSpecial repair the full EA source?

Yes. Send the MQ4 file and the MetaEditor error list. Repair can include compile fixes, trade execution fixes, MagicNumber filtering, spread filters, risk management and MT4 to MT5 conversion.

Continue Your Build

Turn the calculation into an EA

If the tool exposed a profitable or risky condition, convert it into a coded rule with testing and guardrails.

Build MT5 EA Hire Developer
Trust Client Reviews See verified feedback before hiring a solo MT4/MT5 developer. Proof Case Studies Review dashboards, backtests, overlays and market-structure builds. Tools Free Calculators Check pip value, lot size, drawdown, spread, swap and prop-firm risk. Build EA Development Turn the idea into MQL4/MQL5 code with source and testing.
🚀 Invite friends — Earn $5 You both get $5 credit on Go Ad · opencode.ai AI-Powered Coding Agent — Try Free Build apps, fix bugs & ship faster with opencode. Get $5 free credit when you join. × Ad · quo.com QuoPhone — $20 Visa Gift Card Free Sign up to Quo, subscribe 3 months, get a $20 Visa gift card. Atif's referral gift for you. ×