Compiler Fixes
Fix MT5 invalid volume before changing the strategy.
Invalid volume is usually a symbol-contract problem or a sizing bug. The EA calculates a lot size the broker cannot accept, then the trade server rejects the request.
Search intent
The EA gets retcode 10014, invalid volume, or 0.00 lots when sending a trade request.
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Cluster
Compiler Fixes
Tool path
mql5 compiler fixer
Reader
mq5 developer
Read the symbol volume rules
Every symbol can have different min lot, max lot, lot step, and directional volume limit. The EA should read these before sending orders.
Normalize then validate
Rounding is not enough. Normalize the raw lot to the step, clamp to the allowed range, then reject impossible results like 0.00 lots.
Log the sizing chain
When the trade fails, print the raw lot, normalized lot, symbol rules, margin result, and retcode so the next fix is based on evidence.
Use the tool
Paste the sizing block into Workfusion Debugger to add lot-step validation and invalid-volume diagnostics.
Related guides
Continue the EA build path.
Prop Firm Risk
Fixed-risk lot sizing for an MQL5 EA
Calculate EA position size from risk percent and stop distance instead of hard-coded lots.
Compiler Fixes
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.
Prop Firm Risk
Prop firm EA readiness checklist
A practical readiness checklist before using an EA around prop-firm style rules and drawdown limits.