script.EquipSword.OnServerEvent:connect(function(plr,w,v) plr.Character.Humanoid:EquipTool(plr.Inventory:FindFirstChild(v.Name)) end)
script.EquipSword.OnServerEvent:connect(function(plr,w,v) plr.Character.Humanoid:EquipTool(plr.Backpack:FindFirstChild(v.Name)) end)
It's plr.Backpack
not plr.Inventory