Archived topic

BUG in Gutenberg: This block has encountered an error and cannot be previewed

7 replies · Started by ernestw on November 10, 2022

Viewing posts 1–8 of 8

November 10, 2022 at 3:04 am #2409527

Hello,

I am experiencing this bug in the Gutenberg editor: sometimes when I click on simple paragraphs (with no customization, just standard p blocks in WP) I get this message "This block has encountered an error and cannot be previewed". The frontend is ok, and when I reload the editor the error goes away. Anyway, if I click again, I get the same message (randomly, but often).

This is happening in 2 different websites I own, with the latest versions of WP (6.1) and GP pro.

I have cleared the cache, disabled ALL the plugins and kept only GP to test, and created a new post (only paragraphs): the problem persists! When I try a different theme (twenty twenty three) everything works fine, even with all plugins activated...

I am really lost...

Thanks!

November 10, 2022 at 4:42 am #2409667

I have done a lot of testing, and the problem actually seems to be GP. I have created a completely new WP site (local) and I still have this error.

Steps to reproduce:

create a clean WP install
install gp theme (not PRO)
in the customizer set "Container Width" to 2000px
create a post with just some paragraphs and publish it
go to the posts list > edit post
Click on the paragraphs (try multiple times)

Error: "This block has encountered an error and cannot be previewed"

If in the editor preferences I disable "Use theme styles", everything works.

November 10, 2022 at 6:39 am #2409785

Hi there,

so the issue only occurs if you try to edit an existing post ?

Can you Right Click > Inspect to open the browser developers tools whilst in the editor.
When the Error: “This block has encountered an error and cannot be previewed” appears, what errors do you see in the Console tab of the developers tools ?

November 10, 2022 at 6:45 am #2409793

Hi David, thanks for your reply. Yes, it happens in an already published post.
Anyway, I have done some more testing with new local websites, and the Astra theme does it too (when the container is set to full width). I submitted the bug in the Gutenberg Github.

Here is the message:

November 10, 2022 at 7:46 am #2409882

Any particular browser you using ?

November 10, 2022 at 7:50 am #2409997

Firefox (snap) on Ubuntu Linux.
I had no idea it could be a browser problem. In Chrome seems to work fine. Very strange...

Thanks for your help!

November 10, 2022 at 7:56 am #2410091

Yeah, this Range.setStart is a browser API call, which lead me to that thought.
It could be that particular build or a browser extension getting in the way.

Glad to be of some help

November 10, 2022 at 7:57 am #2410092

Thanks David, very kind!

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