Fix MT4 EA Loading Failed Due to DLL Calls - Step by Step

Summary: Fix EA loading failed on MT4 due to DLL calls. This guide shows how to enable DLL imports, adjust settings, and avoid common mistakes.




Step 1: Identify the DLL-Related Error Message
Open MT4 and try to attach the EA to a chart. If a popup says "Expert Advisor cannot load because DLL calls are not allowed" or similar, this guide applies. Screenshot: error popup window.
Step 2: Open MT4 Settings
Click "Tools" in the top menu, then "Options" (or press Ctrl+O). Screenshot: Tools menu dropdown showing Options.
Step 3: Navigate to Expert Advisors Tab
In the Options window, click the "Expert Advisors" tab. You will see several checkboxes. Screenshot: Expert Advisors tab with highlighted options.
Step 4: Allow DLL Imports
Check the box that says "Allow DLL imports". Also check "Allow WebRequest for listed URLs" if needed. Uncheck "Confirm DLL function calls" only if you trust the EA completely (not recommended for unknown sources). Screenshot: checked boxes.
Step 5: Restart MT4
Click OK, then completely close and reopen MT4. Re-attach the EA. The EA should load without the DLL error.
Reference: MetaQuotes Help Desk - Expert Advisors Settings (official documentation).