Operator Don't run in blender python

Hello!

I recently followed a tutorial on making a blender addon Here is the Link

however when i run the script at the end i only get the text “Select a material” which were written in the first class, but i don’t get any button/operator any thoughts on how to fix it??

also note : I have already registered and unregistered

post all of your code, not just a partial screenshot.

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