tkhoangtam The screenshot of the spine.log file you attached contained your license email address, so I deleted that image.
It appears that you are using Spine 4.2, but there was a bug in versions up to 4.2 that caused issues when unpacking webp textures, as described in the following issue:
EsotericSoftware/spine-editor834
This has been fixed in version 4.3.00-beta. Unpacking textures can be done using a different version than the one you are currently working with without any issues, so we recommend using version 4.3-beta for unpacking the webp atlas. We apologize for any inconvenience this may have caused!