How to fix “this block has encountered an error and cannot be previewed” issue in Gutenberg

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Encountering this error in the Gutenberg editor can be frustrating, but it's usually fixable with a few troubleshooting steps. By identifying the root cause—whether it's a theme conflict, plugin issue, or server limitation—you can quickly restore your blocks and continue editing without interruptions.

1. Check for possible errors with the WordPress version
Before troubleshooting further, ensure that you are running the latest part time data stable version of WordPress. Older versions may have bugs that cause blocks to malfunction.

Steps to update WordPress:

Aller à Dashboard > Updates .
If an update is available, click Update Now .
After updating, check if the error persists.
Update the WordPress version when you face "this block has encountered an error and cannot be previewed" error
If the issue began after updating WordPress, consider rolling back to a previous version using a plugin like WP Downgrade.