Entity Use Creates Multiple Derma Panels

[Kozzmo]

Hello, I am experiencing an issue with the ENT:Use function in conjunction with Derma panels. Whenever ENT:Use is activated, the derma panel gets created, however, instead of only an individual derma being created, i get eight. I have ENT:SetUseType( SIMPLE_USE ) in my ENT:Initialize function, but this does not seem to make a difference.
Any help would be appreciated. Thank you for your time.

init.lua ENT:Initialize():
ENT:SetUseType( SIMPLE_USE )

init.lua ENT:Use():
function ENT:Use()
    umsg.Start("printerMenu")
    umsg.Short("1")
    umsg.End()
end

cl_init.lua printerMenu(ply):
function printerMenu( ply )
    local printerMenu = vgui.Create("DFrame")
    printerMenu:SetSize(500,500)
    printerMenu:Center()
    printerMenu:SetVisible(true)
    printerMenu:MakePopup()
end;
usermessage.Hook("printerMenu", printerMenu)

[Spar]

Don't use usermessages, they're deprecated

[Rubat]

While they are deprecated, there's nothing inherently wrong with them.
This is not how you use a function on an entity.

[Kozzmo]

Welp, that was probably the stupidest mistake that i tried to correct on my own for a good hour and a half... Thanks for the help man