When I imported Spine in a brand new project and added SpineURPShader to "PlayerSetting -->Always Included Shaders", I was prompted with an error while building the project.
If I remove these 4 shaders from the "Always included shaders" list, the project can proceed with construction normally.
Spine URP Shader add to "Always Included Shaders" Error
@Qingswe Thanks for reporting and sorry for the troubles! We could reproduce the issue and have just pushed a bugfix for this issue.
New 4.1 and 4.2-beta URP Shaders UPM packages are available for download:
https://esotericsoftware.com/spine-unity-download
Please let us know if this resolves the problem for you as well.
Issue ticket URL for later reference:
EsotericSoftware/spine-runtimes2406