The Collisiongroup not found?

local PhysicsService = game:GetService("PhysicsService")
 
local forcefield1 = game.Workspace.Collision.WashmachineSepcial.Fenster
local forcefield2 = game.Workspace.Collision.MEGAWONDERS.Fenster
local forcefield3 = game.Workspace.Collision.Washmachine5.Fenster
local crate = game.Workspace.Collision.WashmachineSepcial.Unanchored:GetChildren()
local crate2 = game.Workspace.Collision.MEGAWONDERS.minWONDERS:GetChildren()
local crate3 = game.Workspace.Collision.Washmachine5.Unanchored:GetChildren()
local crate4 = game.Workspace.Collision.MEGAWONDERS.Washmachine1WONDERS:GetChildren()

 
local forceFieldGroup = "ForceFieldGroup"
local crateGroup = "CrateGroup"
 
PhysicsService:CreateCollisionGroup(forceFieldGroup)
PhysicsService:CreateCollisionGroup(crateGroup)
 
PhysicsService:SetPartCollisionGroup(forcefield1,forcefield2, forcefield3, forceFieldGroup)
PhysicsService:SetPartCollisionGroup(crate,crate2, crate3, crate4, crateGroup)
 
PhysicsService:CollisionGroupSetCollidable(forceFieldGroup, "Default", false)

I'm trying to make objects not going through a window but players can go through a window. I'm getting the error

• Collision Group does not exist.
• Stack Begin
• Script 'Workspace.Script', Line 18
• Stack End

Collision isnt a valid member of workspace, so it doesnt exist in workspace, but you could do this:

script.Parent.Touched:connect(function(plr)
	local player = game.Players.LocalPlayer
	
    if plr.Parent.Name == player.Name or plr.Parent.Parent == player.Character then
       script.Parent.CanCollide = false
 elseif plr.Parent.Parent == workspace then
	   script.Parent.CanCollide = true
    end
end)