MT4 · Compilation errors
MT4 188 · A constant expression required | YI GOLD
Official meaning
A constant expression required
Possible causes · YI GOLD suggestions
Determine the cause from the official meaning, the triggering function and terminal logs.
Troubleshooting · YI GOLD suggestions
Locate the first reported line in MetaEditor. Check syntax, types, function signatures, includes and file permissions, then recompile.