PhysicsInitBox() Crashing my game

i am trying to make a SENT that will contain the player within its collision bounds, kind of like the stargate sheild but when i use PhysicsInitBox() it will crash my game, if i comment it out, itll load.



function ENT:Initialize()
	self.Entity:SetMoveType(MOVETYPE_NONE)
	self.Entity:SetSolid(SOLID_VPHYSICS)
	local min=Vector(-100,-100,-100)
    local max=Vector(100,100,100)
	self.Entity:SetModel( "models/Combine_Helicopter/helicopter_bomb01.mdl" )
	self.Entity:PhysicsInitBox(min,max)
    local phys = self.Entity:GetPhysicsObject()
    if (phys:IsValid()) then
        phys:Wake()
    end
    self.Entity:SetCollisionBounds( min, max )
end


I met the same problem… If I touch another staff by it as I defined, the game clashes.