404 - FB Share/LI Share

The 404 Error is coming when Facebook and LinkedIn is scanning your pages. It's not an error with the sharing buttons themselves, they're just seeing a title for the page as "404 Error" and thinking that's the title you want.

Can you let me know what URL your clicking the share button from? We can help investigate from there.

Thanks,
Alex

Gotcha. If running the debugger fixes the issue, it means the page was likely shared before it was publicly accessible or something like that. Basically, Facebook tried to scan the page before it was public, so Joomla (properly) returned a 404 page. Facebook then used that 404 information as the page's data.

The debugger fixes those issues immediately. Facebook will also re-scan pages every few days, so it would have resolved itself on its own too.

Alex