Adding Custom Shipments/ Model Trouble

I am having trouble with adding custom shipments to my server. In a file that i downloaded, it had certain lua scripts that you put into “addshipments” folder. EX: AddCustomShipment(“M249”, “models/weapons/w_mach_m249para.mdl”, “weapon_real_cs_m249”, 6000, 10, true, 0, false, {TEAM_GUN}). I put this in my add shipments folder the way that i am soposed to do. then when i went on the server, i spawned the shipment and clicked “E” on it to spawn a gun. When i do so, it pops an ERROR. I checked back in my srcds/orangebox/garrysmod/models/weapons folder. ALL of the .MDL (model) files are there. and it still pops up “ERROR” after i hit “E” on the shipment box. HELP!

EX:
Lua script: AddCustomShipment(“M249”, “models/weapons/w_mach_m249para.mdl”, “weapon_real_cs_m249”, 6000, 10, true, 0, false, {TEAM_GUN})

Model folder for that gun: w_mach_m249para.mdl

~Thanks
-LemonHead