miao Thanks for sending us your skeleton files! I have confirmed that I can reproduce the problem, and I have found a workaround for this problem. Try packing a texture in webp format for any project. For example, open the Spineboy project and pack it in webp format. Then open the texture unpacker and the unpacking works. I believe this is a bug and will create an issue ticket to fix this problem.
By the way, this forum has a translation button, so feel free to post or reply in your native language.
