MQL compiler fixes
Fix the first MQL compiler blocker before changing strategy logic.
This cluster groups the narrow repair paths builders search for when MetaEditor, broker constraints, or indicator buffers block the next compile/test loop.
Cluster guides
Open the narrow guide before changing code.
Each guide links back to a matching Workfusionapp workflow so readers can move from search intent to a concrete diagnostic step.
mql5 compiler fixer
Fix undeclared identifier in an MQL5 EA
A practical checklist for fixing undeclared identifier errors in MT5 Expert Advisor code before compiling again.
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mql5 compiler fixer
Fix 'trade' undeclared identifier in MQL5
Fix the MT5 compiler error where trade.Buy or trade.Sell fails because the CTrade object was not included or declared correctly.
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mql5 compiler fixer
Fix invalid stops in an MT5 EA
How to diagnose invalid stop-loss and take-profit errors in MT5 Expert Advisors before live or tester execution.
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mql5 compiler fixer
MQL5 CTrade include and trade object setup
Set up the MQL5 CTrade object correctly so Buy, Sell, PositionClose, and result checks compile cleanly.
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mql5 compiler fixer
Fix MQL5 CopyBuffer and indicator handles
Fix MT5 EA errors caused by using MQL4-style direct indicator calls instead of MQL5 handles and CopyBuffer.
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mql5 compiler fixer
Fix MQL5 history and deal functions
Fix MT5 EA errors around HistoryDeals.mqh, HistoryDealGetTicket, deal properties, magic numbers, and closed-trade PnL.
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mql5 compiler fixer
Fix MQL5 invalid volume and lot step errors
Fix MT5 retcode 10014 invalid volume errors caused by 0.00 lots, min/max lot limits, lot step mismatch, or unsafe sizing.
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mql5 compiler fixer
Fix MQL5 unsupported filling mode
Fix MT5 retcode 10030 invalid fill errors by selecting an order filling policy supported by the current symbol.
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mql5 compiler fixer
Fix MQL5 array out of range after CopyBuffer
Fix MT5 runtime array out of range errors caused by reading indicator buffers before enough data was copied.
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mt5 ea generator
MQL5 OnInit and OnTick EA skeleton
A clean MT5 Expert Advisor skeleton structure for OnInit, OnTick, risk gates, signal checks, and execution.
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mql5 code review
MT5 EA compiles but does not trade
A structured diagnostic checklist for MT5 Expert Advisors that compile but produce no trades.
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mql5 compiler fixer
MQL5 compile errors cheat sheet
A practical map from common MetaEditor MQL5 compile errors to the first fix to try before editing strategy logic.
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Related diagnostic tools
Use the page that matches the first blocker.
These tool pages keep the cluster connected to concrete free-desk workflows and reduce orphaned SEO paths.
MQL5 compiler fixer
Route MetaEditor errors into the first-error repair workflow.
Open diagnostic page
MQL5 compiler online workflow
Prepare code for static checks and protected MetaEditor compilation.
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Undeclared identifier fixer
Fix missing variables, functions, includes, and object scope.
Open diagnostic page
CTrade fixer
Repair Trade.mqh includes, CTrade objects, and trade call wiring.
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CopyBuffer fixer
Convert indicator reads into safe handle and buffer checks.
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Array out of range fixer
Guard copied counts and unsafe buffer indexes before retesting.
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History deal functions fixer
Clean up HistorySelect and deal-ticket loops for closed-trade logic.
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iMA CopyBuffer buffer-index fixer
Fix moving-average handles, buffer 0 reads, and copied-count checks.
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MT5 invalid stops fixer
Check SL/TP side, stop level, freeze level, spread, and normalization.
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MT5 invalid volume fixer
Fix lot-step, min/max volume, 0.00 lots, and sizing diagnostics.
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Unsupported filling mode fixer
Detect symbol fill policies and route order-send failures correctly.
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Optional follow-up
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Run free deskMQL compiler fixes follow-up
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