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So I've got the dreaded error too it seems. Apparently it's a very common issue but I can't really seem to get a hang on the fix.

One of the plugins my theme uses is causing the error as per the log I got in the email WordPress sent to my admin email. Here's the full log

Error Details
=============
An error of type E_ERROR was caused in line 8 of the file /home/younited/domains/younitedsupport/public_html/wp-content/plugins/rb-essentials/metaboxes/rb_metaboxes.php. Error message: Uncaught Error: Call to undefined function rb_get_metabox() in /home/younited/domains/younitedsupport/public_html/wp-content/plugins/rb-essentials/metaboxes/rb_metaboxes.php:8
Stack trace:
#0 /home/younited/domains/younitedsupport/public_html/wp-content/plugins/rb-essentials/metaboxes/metaboxes_exec.php(200): rb_setup_metaboxes()
#1 /home/younited/domains/younitedsupport/public_html/wp-includes/class-wp-hook.php(289): rb_save_metaboxes(4585)
#2 /home/younited/domains/younitedsupport/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#3 /home/younited/domains/younitedsupport/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#4 /home/younited/domains/younitedsupport/public_html/wp-includes/post.php(4260): do_action('save_post', 4585, Object(WP_Post), false)
#5 /home/younited/domains/younitedsupport/public_html/wp-admin/includes/post.php(687): wp_insert_post(Array)
#6 /home/younited/domains/younitedsupport/public_html/wp-admin/incl

Here's some additional information:
WordPress version 5.5
Current theme: Setech | Shared by WPTry (version 1.0.2)
Current plugin: RB Essentials (version 1.0.1)
PHP version 7.3.19

The website was running fine until yesterday on the exact same configuration. I made no changes that caused this error.

As you can guess, I have absolutely zero ideas what this means. I've tried disabling the plugin and reloading the site but it didn't work. Also, if I try to change the theme I get an HTTP 500 Internal Server Error(File "/home/younited/domains/younitedsupport/public_html/wp-admin/themes.php" is writeable by group) when clicking on the themes pages in WordPress.

The same site on my localhost works just fine BTW. Everything is identical between the two sites. Any ideas on how to fix this?

So I've got the dreaded error too it seems. Apparently it's a very common issue but I can't really seem to get a hang on the fix.

One of the plugins my theme uses is causing the error as per the log I got in the email WordPress sent to my admin email. Here's the full log

Error Details
=============
An error of type E_ERROR was caused in line 8 of the file /home/younited/domains/younitedsupport/public_html/wp-content/plugins/rb-essentials/metaboxes/rb_metaboxes.php. Error message: Uncaught Error: Call to undefined function rb_get_metabox() in /home/younited/domains/younitedsupport/public_html/wp-content/plugins/rb-essentials/metaboxes/rb_metaboxes.php:8
Stack trace:
#0 /home/younited/domains/younitedsupport/public_html/wp-content/plugins/rb-essentials/metaboxes/metaboxes_exec.php(200): rb_setup_metaboxes()
#1 /home/younited/domains/younitedsupport/public_html/wp-includes/class-wp-hook.php(289): rb_save_metaboxes(4585)
#2 /home/younited/domains/younitedsupport/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array)
#3 /home/younited/domains/younitedsupport/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#4 /home/younited/domains/younitedsupport/public_html/wp-includes/post.php(4260): do_action('save_post', 4585, Object(WP_Post), false)
#5 /home/younited/domains/younitedsupport/public_html/wp-admin/includes/post.php(687): wp_insert_post(Array)
#6 /home/younited/domains/younitedsupport/public_html/wp-admin/incl

Here's some additional information:
WordPress version 5.5
Current theme: Setech | Shared by WPTry (version 1.0.2)
Current plugin: RB Essentials (version 1.0.1)
PHP version 7.3.19

The website was running fine until yesterday on the exact same configuration. I made no changes that caused this error.

As you can guess, I have absolutely zero ideas what this means. I've tried disabling the plugin and reloading the site but it didn't work. Also, if I try to change the theme I get an HTTP 500 Internal Server Error(File "/home/younited/domains/younitedsupport/public_html/wp-admin/themes.php" is writeable by group) when clicking on the themes pages in WordPress.

The same site on my localhost works just fine BTW. Everything is identical between the two sites. Any ideas on how to fix this?

• plugins
• themes
• errors
• fatal-error
• 500-internal-error

Share Improve this question asked Aug 20, 2020 at 8:31 YaddyVirusYaddyVirus 11144 bronze badges 5

• Your error states that it doesn't like line 8 of a particular file in the rb-essentials plugin. I'm not sure anyone here would say anything other than to contact the plugin developer... but... if you were to upload some of the code from that file there may be a more obvious issue. So can I suggest, find line 8 in the plugin file mentioned in the first line of the error and add to your original question not just that line but the function it sits within (e.g. above and below it if relevant). No need to upload the whole thing. Though in theory if you deactivate that plugin, the error should go? – t2pe Commented Aug 20, 2020 at 8:59
• I tried deactivating the plugin but it didn't do anything. Also, the plugin is a theme essential so disabling it would basically break the theme I guess. – YaddyVirus Commented Aug 20, 2020 at 9:03
• If the theme depends on the plugin then yes I guess it would cause a secondary error, though the error text should in theory be different. I'd still upload the function in line 8 to your question though. If folks here see the code they may have an idea. – t2pe Commented Aug 20, 2020 at 9:05
• It'll take me a little while. Will do – YaddyVirus Commented Aug 20, 2020 at 9:12
• Instead of deactivating the plugin try rename the rb-essential plugin directory. – Behemoth Commented Aug 20, 2020 at 14:41

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2 Answers 2

Sorted by: Reset to default 1

So I reinstalled WordPress on both my live and local environments and downgraded to version 5.4.2 and everything seems to be working just fine, so far.

I'll update if anything breaks again.

I don't think this is an answer as such but I need a bit more space than the comment box allows...

Your line here:

"Also, if I try to change the theme I get an HTTP 500 Internal Server Error(File "/home/younited/domains/younitedsupport/public_html/wp-admin/themes.php" is writeable by group) when clicking on the themes pages in WordPress."

Suggests that the secondary error is complaining about file/folder permissions (ie. "is writeable by group").

If the file permissions were wrong it could potentially...

1. Explain why your dev environment is ok when the live environment isn't
2. Prevent some files being loaded which would then in turn lead to undefined function errors (and others)

If you've not changed the file permissions and this has happened suddenly, I would at least check that the site is healthy using one of the well-known security plugins. You could also check if there was a difference in the permissions via cPanel, or even the command line if you have access.

It's just a thought - that line about 'writable by group' is a warning flag of sorts.

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