> For the complete documentation index, see [llms.txt](https://nghiaxchis.gitbook.io/ncmaz-wordpress/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nghiaxchis.gitbook.io/ncmaz-wordpress/theme-installation/error-after-update-theme.md).

# Error after update theme!

Export error "**This block contains unexpected or invalid content**" when after update plugin "**ncmaz-core**"

<div align="left"><img src="/files/9LwTo7lkhSKkzk4MAgfX" alt="Screenshot when have problem "></div>

**SOLUTION**:

Don't worry, after every plugin **ncmaz-core** is updated, there are always edits (add/edit/delete) in the code of ncmaz-Gutenberg block, so WordPress editor will appear error message like above.

You calm down and just click the "**Attempt Block Recovery**" button and the Gutenberg block will be restored.

Thanks.

### **\*\* JSON at position 0:**

<https://nghiaxchis.gitbook.io/ncmaz-wordpress/gutenbergs/unexpected-token-less-than-json-at-position-0>