Entity [0][phys_constraint]

[KoffeSwed]

Hi, i got a weird error that i can't make sense out. this is what it sends me:

Entity [0][phys_constraint]

and this is the code.

[LUA]function spawntowtruck( ply, key, activator, caller, CMoveData, hooktows )

towtruck = ents.Create("prop_vehicle_jeep")
towtruck:SetModel("models/statetrooper/ram_tow.mdl")
towtruck:SetKeyValue("vehiclescript","scripts/vehicles/statetrooper/ram3500_tow.txt" )
towtruck:Spawn()
towtruck:SetPos(Vector(96.216995, 811.046936, -83.379456))
ninety_eight = ents.GetByIndex(towtruck:EntIndex())
print (ninety_eight)

local buttonfortow = ents.Create( "entity_tow" )
buttonfortow:SetPos(towtruck:GetPos()+Vector(50,-55,45))
buttonfortow:SetAngles(towtruck:GetAngles()+Angle(90,0,0))
buttonfortow:Spawn()
constraint.Weld(buttonfortow,towtruck,0,0,0,0,true)
print ("towtruckbutton1spawned")

hook.Add( "PlayerUse", "some_unique_nameforyou", function( ply, ent, spawntowtruck )
if (ent:GetClass() == "entity_tow") then
local tr = ply:GetEyeTrace() --Get an eye trace
local poss = ply:GetPos()
local ent = tr.Entity --Get the entity hit by the eye trace, if anything
local ninety_six = ents.GetByIndex(ent:EntIndex())
local Distance = ( constraint.GetAllConstrainedEntities( ninety_six ) )
print (ninety_six)
print ("ok")
print (constraint.FindConstraintEntity(ninety_six,"Weld"))
end
end )

end

function spawntowtr()
spawntowtruck()
end
[/LUA]

[editline]21st November 2016[/editline]

And the spawn message:

Vehicle [204][prop_vehicle_jeep]
towtruckbutton1spawned
Entity [216][entity_tow]
ok
Entity [0][phys_constraint]
Entity [216][entity_tow]

[Rubat]

What exactly is "Weird"? What is the problem? Where's the error?

[KoffeSwed]

It should find the second entity but it doesn't give the others entity id.
I don't know if it is because i'm failing to understand the code or if there is another problem not caused because of the code.