trewDeliveryMarket issue

[duckysuck]

client:204 attempt to call a nil value (global 'trewDeliveryDrawMarker')

relates to this;

-- YOU CAN SEE THE MARKER FROM 40 METERS AWAY
if distance <= markervisibility then

					trewDeliveryDrawMarker(
						20,
						{ blips[currentblip]['x'], blips[currentblip]['y'], blips[currentblip]['z'] },
						{ r, g, b }
					)

					-- ... AND BY 1.2 METERS, THE HELPER WILL SHOW.
					if distance <= 1.2 then

Could it be because I have the radar map off when not in a car?