Textures problem on PAC3

Hello everyone, I am testing out PAC 3 and with this guide here ( https://github.com/CapsAdmin/pac3/wiki/In-Depth-Guide-to-Bringing-Custom-Models-and-Textures-into-PAC3 ) I am able to add custom models in PAC3. But the problem is the textures always because translucent checkered box everytime, regardless on whatever textures I use.

This is an example before I add textures


After adding textures…



Is there anyway to fix this?
I would really appreciate any help. Thanks.

Use something other than Google Drive.