Can't change the blank.potx that is in the guide

[SuperNinjaDK]

So im trying to edit the code to use the potx that i need in the code but it dosen't work.
I have put all of the filles in this link https://drive.google.com/drive/folders/1TGeY3umh7t3dgD6dHlZ-6DMDaiIM8zAe?usp=sharing
Hope you can help