ElGringo's Inventory System

When my players open their backpack they only have 1 slot no matter what backpack and this error came up when I used the backpack checker.

[ERROR] lua/vgui/dmodelpanel.lua:63: bad argument #1 to 'ClientsideModel' (string expected, got boolean)

1. ClientsideModel - [C]:-1
2. SetModel - lua/vgui/dmodelpanel.lua:63 3. DrawModel - addons/eg_inventory/lua/autorun/client/cl_inventory_skin.lua:261 4. openInspectInventory - addons/eg_inventory/lua/autorun/client/cl_inventory_inspector.lua:106 5. func - addons/eg_inventory/lua/autorun/client/cl_inventory_inspector.lua:5 6. unknown - lua/includes/extensions/net.lua:32

then when they open their backpack they get

[ERROR] lua/vgui/dmodelpanel.lua:63: bad argument #1 to 'ClientsideModel' (string expected, got boolean)

1. ClientsideModel - [C]:-1
2. SetModel - lua/vgui/dmodelpanel.lua:63 3. DrawModel - addons/eg_inventory/lua/autorun/client/cl_inventory_skin.lua:261 4. OpenMyInventory - addons/eg_inventory/lua/autorun/client/cl_inventory_player.lua:138 5. unknown - addons/eg_inventory/lua/weapons/weapon_eginventory/shared.lua:62