Sent to create children SENT spamming console with Error Vertex File

[spikeman14]

I have a sent (dumpster)which is designed to spawn melons.

The melons are spawning, but they are invisible. I know this because they are programmed to attack players, and they keep hitting me and killing me, but they are invisible.

I have no lua errors, but in my game console I am getting

Error Vertex File for 'props_junk/watermelon01.mdl' checksum 1037217748 should be -552311702

What does this even mean? Why are the invisible?

Below is the code for the dumpster that is spawning the evil melons

function ENT:Think()
		local location = self:GetPos()
		
		local ent = ents.Create( "jumper" )


		if (  !IsValid( ent ) ) then return end
		ent:SetPos( location + Vector(0,0,200 )  )
		
		ent:Spawn()
		ent:SetModel( "models/props_junk/watermelon01.mdl" )
		local phys = ent:GetPhysicsObject()
		if (  !IsValid( phys ) ) then ent:Remove() return end
		local velocity = Vector(0,0,100 )
		velocity = velocity * 5000 
		velocity = velocity + ( VectorRand() * 100 ) -- a random element
		phys:ApplyForceCenter( velocity )
	    self:NextThink( CurTime() + math.random(2,10)) -- Make sure that Think() is called.
 return true
        
end

Thanks in advance!