MT4 · Compilation errors
MT4 290 · Invalid index for a property in #property | YI GOLD
Official meaning
Invalid index for a property in #property
Possible causes · YI GOLD suggestions
Array size, index, type or series orientation violates function requirements.
Troubleshooting · YI GOLD suggestions
Check length, bounds, dynamic-array declarations and ArraySetAsSeries. Validate returned element counts before access.