Class __PHP_Incomplete_Class has no unserializer

GD has disabled the offending their Object Cache Plugin (designed by them to negate the need for other caching plugins, which also explains why other cache plugins appear on the plugin blacklist), flushed the cache, and bingo, it’s worked.

But now I have no caching on my site ?? Luckily, my site is rather static at the moment.

GD told me that, ‘yes their plugin (which is part of their managed wordpress hosting plan) is a known problem since WP 4.5. They are working on it, and a fix date is unknown.’

Does anyone know how to fix line 520 in the GD plugin? Doesn’t mean much to me…

$value = apc_fetch( $key );

All. I’ve written to Mark Jaquith (the creator of the Object Cache Plugin used by GD in the their Managed WP Hosting Accounts) at coveredwebservices.com . Maybe he has a solution.

@youninnovators This is my sitemap. Mobile version is showing only warnings and not the actual site.

@younginnovators These are the warnings I see most of the time.
Warning: Class __PHP_Incomplete_Class has no unserializer in /home/content/n3pnexwpnas02_data03/18/2964218/html/wp-content/object-cache.php on line 520

Warning: Cannot modify header information – headers already sent by (output started at /home/content/n3pnexwpnas02_data03/18/2964218/html/wp-content/object-cache.php:520) in /home/content/n3pnexwpnas02_data03/18/2964218/html/wp-includes/pluggable.php on line 1171

@younginnovators Will your solution work for me as well?

@younginnovators Your solution worked on desktop site but mobile site is still showing some warnings.

@ritesh then I would suggest you to check @luke Chiodo comment

@younginnovators Your solution worked but it doesn’t work only on mobile when I don’t type www before my domain name. It returns same warnings then.

I’m also getting this issue on my Yoast page sitemap xml. I am also using Godaddy managed web hosting. This is a fairly big issue if it’s messing up sitemaps too. Flushing cache from Godaddy menu didn’t work for me :s

@jtibbles Yes, the Object Cache Plugin that is standard (mandatory) with GoDaddy’s Managed WordPress Hosting Account will cause the sitemap errors, and in turn, report errors on your Google Webmaster Console.

The only way you can re-submit your sitemaps is to contact GoDaddy and ask them to manually disable the offending plugin. Jump on Google Webmaster Console and re-submit sitemaps. Or, if you can access FTP, under wp-content, and simply disabling the plugin by editing the plugin file name to: object-cache.php.bak then re-submit sitemaps.

Flushing cache, either yourself or via GoDaddy works temporary, if at all.

Thanks for the reply @luke Chiodo. They don’t give ftp access to that section so I’ll have to ask them to sort it. Bit of a major foobar from Godaddy

@jtibbles Try what @younginnovators has said. It solved the issue for desktop site but returns the same warnings on mobile site without www.

Thanks @ritesh Nishar @younginnovators. I can confirm that works! ??

I’ve reached out to a contact at GoDaddy to see if they have any idea what’s going on.

I think what this means is that a PHP object stored in the cache is being fetched (and then re-instantiated), but its class definition doesn’t exist. So PHP doesn’t know how to create it. I’m not entirely sure what would have caused this to start happening all of a sudden, but I’m gonna look into it.

Hey guys! We are actively looking into the issue at the moment. We will let you know when we have deployed the fix.