haohaomao My guess is that you probably downloaded our spine-godot custom build and then installed the GDExtension on top of it. In fact, I tried that on my end and was able to reproduce the same error log.
The spine-godot GDExtension is intended for builds that can be done from the official Godot download page, or for other Godot custom builds that want to be able to use the Spine skeleton.
If you want to use our custom build of spine-godot, you do not need to install the spine-godot GDExtension.
