Error while create or edit post

As an immediate and temporary fix, you could try to disable all Jetpack blocks form loading in the block editor, by adding the following code snippet to your site:

add_filter( 'jetpack_gutenberg', '__return_false' );

Once that’s out of the way, do you think you could tell me more about your site, so I can try to reproduce this issue?

1. Do you use any other plugin that may add additional blocks to the block editor?
2. Do you see this error in all browsers, or in a specific one?

Thank you!

I seem to see a number of other plugins currently active on your site, like the Accordion Blocks plugin. Could you try to deactivate them one by one, for a few minutes, and see if you can find a specific plugin that conflicts with Jetpack?

Thank you!

Hm, I can’t seem to be able to reproduce the issue at the moment. Both plugins play well together on my end.

If you reinstall the plugin from scratch, do you still experience issues?

I wonder if this may be a conflict between Progress Bars, Jetpack, and a third plugin on your site.

If you’re ever interested in using that block plugin again, it may be worth trying to use Jetpack, that plugin, and no other block plugins. If the error disappears then, you can try to re-activate each one of your other block plugins, one at a time, until the problem appears again.