"Sorry, unable to map your existing skeleton."
Hello!
I've encountered this error whilst trying to upload my 3d model here:
https://drive.google.com/file/d/1ucVto3QHxO5sHCDZxRYqLVjNdZ_-QmnW/view?usp=sharing
I cannot figure out what is causing the error; I've tried to disable materials and it did not work. I'm very new to Blender so if possible, providing an explanation would be of great help!

Thank you



remove the bones