Warning: Unhandled usermessage

[Casavant]

I'm trying to figure out why most of my NPC's I have are getting this and not opening:
Warning: Unhandled usermessage 'HeliShop_BMSellShowMenu'
Here's the actual file for it.
ENT.Base = "base_ai" 
ENT.Type = "ai"

if( CLIENT ) then

ENT.RenderGroup = RENDERGROUP_BOTH

function ENT:Draw()

self.Entity:DrawModel()

end

elseif( SERVER ) then

local schdStay = ai_schedule.New( "BMShop NPC Stay" )
local NewTask = ai_task.New()
NewTask:InitEngine("TASK_WAIT_INDEFINITE", 0) NewTask.TaskID = 1
schdStay.TaskCount = table.insert(schdStay.Tasks, NewTask)

function ENT:Initialize()

self:SetModel( helishop.BMshops[self.Entity.BMshop]["model"] )

self:SetHullType( HULL_HUMAN );
self:SetHullSizeNormal();

self:SetSolid( SOLID_BBOX ) 
self:SetMoveType( MOVETYPE_STEP )
  self:SetCustomCollisionCheck(true)
self:CapabilitiesAdd( bit.bor(CAP_MOVE_GROUND, CAP_OPEN_DOORS, CAP_ANIMATEDFACE, CAP_TURN_HEAD, CAP_USE_SHOT_REGULATOR, CAP_AIM_GUN) )

self:SetMaxYawSpeed( 5000 )

self:SetUseType(SIMPLE_USE)

end

function ENT:SelectSchedule()

self:StartSchedule( schdStay )

end

function ENT:AcceptInput( name, activator, caller )

if( !caller:IsValid() || !caller:IsPlayer() || name != "Use" ) then return end
if (caller:Team() != TEAM_CITIZEN) then 
Notify(caller, 0, 9, "You must be a citizen to use this NPC!")

self.LastUse = CurTime() + 1
if (self.LastUse > CurTime()) then 
return
end
end
umsg.Start( "HeliShop_BMShowMenu", activator )
umsg.Long( caller.LastPackage1 )
umsg.Long( caller.LastPackage2 )
umsg.Long( caller.LastPackage3 )
umsg.Bool( caller.VehicleData["H500WeaponPack"] )
umsg.Bool( caller.VehicleData["LittleBirdWeaponPack"] )
umsg.Char( caller.HasPackage )
umsg.Entity( self )
umsg.End()
end
end
Any help would be appreciated!

[MPan1 banned]

Maybe you need to use umsg.PoolString? it's better to use net messages though.

[Bobblehead]

You should use net messages, BUT this means that the following code is missing from your clientside files:
usermessage.Hook("HeliShop_BMShowMenu", function(umsg)
umsg:ReadLong()
umsg:ReadLong()
umsg:ReadLong()
umsg:ReadBool()
umsg:ReadBool()
umsg:ReadChar()
umsg:ReadEntity()
end)
This isn't the exact code but it's something like this. You might be missing an addon file that goes with those NPC's