# Error after update theme!

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

<div align="left"><img src="https://530196433-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MkLlWhHHtTtRu9KLMyW%2Fuploads%2FUoYAoZUkAwxeAC7yM0n5%2Fimage.png?alt=media&#x26;token=8839fc0f-c9d5-4e0e-91cc-52e94600231c" 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>