Container Block Not Recognized on Site Migration

karks88
June 18, 2026 at 3:49 am

Hi Folks,

I’m migrating a client’s site to a new host and checking it before switching to our new server. I’m noticing an issue when using the temporary URL, where Container blocks aren’t being recognized.

I receive these messages, depending on the page:
“This block has encountered an error and cannot be previewed”
“Your site doesn’t include support for ‘generateblocks/container’ block. You can leave it as-is, convert it to custom HTML, or remove it.”

Everything works correctly on the production website. Do you have any suggestions for fixing the issue? Both GenerateBlocks and GenerateBlocks Pro are installed and active (the test site is an exact copy).
karks88
June 18, 2026 at 4:02 am

In my troubleshooting, the issue appears to be related to the Event Tickets Plus plugin. As I mentioned, everything works great on my production site with that plugin activated. Very strange…
George
June 18, 2026 at 5:10 am

Can we see both URLs please?
karks88
June 18, 2026 at 5:18 am

Sure thing, I’ve included the URLs!
George
June 18, 2026 at 5:42 am
Hi,

I checked the migrated site’s front end and everything looks good: the URLs have all been updated correctly to the new domain, and GenerateBlocks is loading and rendering fine on the live pages. So this isn’t a migration or URL problem, and the blocks themselves are healthy.

The errors you’re seeing only happen inside the editor. When a plugin’s editor script runs into a JavaScript error, it can stop everything after it from loading — including GenerateBlocks registering its blocks. That fits exactly with what you found: deactivating Event Tickets Plus makes the problem go away.

Could you do one quick check to confirm?
1. Open one of the affected pages in the editor (with Event Tickets Plus active).
2. Right-click the page and choose Inspect, then click the Console tab.
3. Look for any red error messages and copy them here.
That console error should tell us exactly which script is breaking. Since this only happens on the new host, it’s likely something Event Tickets Plus needs in that environment (a setting or PHP version difference) rather than a GenerateBlocks issue — but the console message will confirm it.
karks88
June 18, 2026 at 5:46 am

Thanks, George! Here’s what I’m seeing:

09:44:04.827 TypeError: can’t access property “getAtRule”, e(…) is undefined
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George
June 18, 2026 at 6:15 am
Hi,

The most common cause of this after a migration is a version mismatch between GenerateBlocks and GenerateBlocks Pro — if the copy brought over slightly different versions of the two, or a half-updated set of files, the editor script can break exactly like this.

Could you check a couple of things on the migrated site for me?
1. On the Plugins screen, what are the exact version numbers of GenerateBlocks and GenerateBlocks Pro? It’s worth comparing them to your production site too — they should match.
2. Is there any caching or optimization active on the new host? Hostinger has its own built-in cache. If you can, clear that cache, then hard-reload the editor (Ctrl+F5) and check whether the error still appears.
Once I have the version numbers, I’ll know whether we’re looking at a mismatch or something else.
karks88
June 18, 2026 at 6:25 am

GenerateBlocks: 2.2.1
GenerateBlocks Pro: 2.5.0

That matches on both versions of the site (we copied a production backup from June 16).

Hostinger does have cache, which I’ve cleared via their dashboard (though I’m not sure it’s active yet). I also tried the hard reset in the editor, which didn’t work. I tried an incognito browser window as well.

For what it’s worth, I experienced this same problem when trying to make a local copy of this site a while back. I got busy with other things and didn’t dig into it further.

Edit: I downloaded fresh copies of both GenerateBlocks plugins, but still no luck. Are there are any cache files assoicated with the plugins I should clear?
Ying
June 18, 2026 at 8:46 am

Can you provide credentials to log into your migrated site so we can take a look at the backend?
karks88
June 18, 2026 at 8:55 am

Sure, I just shared it!

I’m also beginning to wonder if it has something to do with how Hostinger handles temporary domains.
Ying
June 18, 2026 at 9:40 am

I can see that the issue is caused by the Event ticket plus plugin. Can you confirm the 2 sites are using the same version of the plugin?
karks88
June 18, 2026 at 9:42 am

Thanks for checking! Yes, both sites use version 6.9.3 of Event Tickets Plus.
Ying
June 18, 2026 at 10:14 am

That’s very weird, I can not tell what the cause is…

I also installed the Kadence block plugin to test. It turns out that when the Event ticket plus is enabled, the Kadence block doesn’t work either.

So it looks like the Event ticket plus plugin affects other blocks as well, GB is just one of them. The test page is called the Kadence block test. Please check.

I would recommend reaching out to Event Ticket Plus plugin’s support and letting them know about this issue.
karks88
June 18, 2026 at 10:16 am

Thanks, Ying! I can confirm the issue with Kadence as well. I’m not quite sure why Event Tickets Plus would interfere.

The good news is that the client hasn’t used it in quite some time, so we may just remove it. But I will ping their support as well.
Ying
June 18, 2026 at 10:17 am

Great! Hope their support can help with the issue 🙂
karks88
July 7, 2026 at 3:21 am

Hi Folks, I just wanted to update you on this. I contacted Event Tickets Plus support about the issue. It took a couple of weeks for them to determine the cause of the Block Editor errors: missing columns in one of the plugin-specific database tables.

It turns out that a few columns went missing during our site migration. Somehow, that interfered with the Block Editor (even if we weren’t using any blocks from Event Tickets Plus). Restoring those columns fixed the issue.

Thanks for your help with this! I wanted to share the solution in case you saw it again.

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