Shipments not spawning

Hi, I have made some custom shipments for the gun dealers and they show up in the f4 menu fine however when you try to spawn them in an error message appears saying shipment unavailable

[editline]20th August 2016[/editline]

The message appears in the lower right corner of the screen

Go into your console and paste the full error please

there is no error in the console it simply says the weapon is currently unavailable in the bottom right corner of my screen