[Plugin: WordPress SEO by Yoast] Conflict with All-in-One Calendar: Titles and Metas Admin Page not

I can confirm this issue exists and can be reproduced.

I have the same setup and haven’t found a workaround that will allow me to run both plugins simultaneously.

Here’s the solution – Download and install the RC2 version of the upcoming version of the plugin.

https://then.ly/rc/1.8/

They have fixed this bug in the next version – and running the beta until they release the full version will fix this problem.

I installed the 1.8 Premium RC2 version and received this error message: Fatal error: Call to a member function add_cap() on a non-object in /home/—–/public_html/wp/wp-content/plugins/all-in-one-event-calendar/app/helper/class-ai1ec-platform-helper.php on line 95

Any ideas on how to resolve this?

It looks like its having trouble adding capabilities to user roles.

The specific line (95) seems to be trying to add the “edit_posts” capability to the “contributor” role.

Are you running with altered user roles – either by changing the roles in the database or through a user-management plugin? If so, try deactivating the plugin.

If that doesn’t work try commenting out the contributor case in the file mentioned in your error – “class-ai1ec-platform-helper.php” in the app/helper folder.

Change:

case 'contributor':
	$role->$action( 'edit_posts' );
	$role->$action( 'delete_posts' );

To:

/* case 'contributor':
	$role->$action( 'edit_posts' );
	$role->$action( 'delete_posts' ); */

That should remove the ability for contributors to edit any events – but should hopefully also potentially fix your issue.