Audience
For MT5 EA builders stuck on MetaEditor errors, retcodes, CopyBuffer runtime failures, or a backtest that does not behave like live/demo.
MQL5 compiler support page
Fix the first MQL5 compiler or runtime error before the whole EA becomes noise.
Paste one MetaEditor compiler or runtime error, get the likely root cause, generate a corrected MQL5 draft, then run a compile check before manual testing.
Example error this page is built around
'trade' - undeclared identifier retcode=10014 invalid volume retcode=10030 unsupported filling mode array out of range after CopyBuffer
These are different root causes: CTrade setup, broker volume rules, symbol filling policy, and unsafe indicator-buffer reads. Workfusion now routes each case to a narrower fix path and tutorial.
Focused on the first MetaEditor or journal error
Detects invalid volume, invalid fill, invalid stops, and CopyBuffer range failures
Keeps the full EA context attached
Tracks opt-in source as compiler_fixer
Send me the fixed EA workflow
Opt in with the exact compiler-error intent. This creates one CRM lead tied to the compiler_fixer page, so we can measure whether this support page converts better than the homepage.
Intent locked: compiler error support
Choose the workflow you want, then opt in so the CRM source is measurable.
Problem
The first compiler/runtime error is often the real blocker. After that, MetaEditor and the journal can show secondary errors that waste time and push developers into random edits.
Outcome
Workfusion keeps the workflow narrow: paste the error, preserve the EA context, generate a corrected draft, run a compile check, then download only after the code is reviewable.
Support path
One problem, one fix path.
This page is intentionally narrow. It is built to convert high-intent developers who already have a compiler error, not casual homepage visitors.
1. Fix the first error, not the full cascade
Start at the first MetaEditor line number. Later errors can disappear once the missing include, object, function signature, or brace is fixed.
2. Preserve the full EA context
Paste the EA draft around OnInit, OnTick, includes, inputs, and the failing trade call. Snippets are often too small to repair safely.
3. Generate a corrected draft, then compile-check
Workfusion returns a full corrected MQL draft and runs the static/MetaEditor compiler path when the worker is configured.
Workflow
From idea or error to a cleaner EA draft.
Workfusion keeps the output tied to code quality, compiler readiness, and explicit risk review. It does not promise trading performance.
Step 1
Paste the exact error line
Step 2
Paste enough EA context
Step 3
Generate the corrected draft
Step 4
Run compile check and download
Should I paste every compiler error?
Paste the first error and the relevant EA context first. A long cascade is useful only after the root blocker is visible.
Does this replace MetaEditor?
No. It prepares and fixes code, then uses MetaEditor when the compiler worker is online.
Can it guarantee a profitable EA?
No. It is a coding and readiness workflow, not a trading performance promise.