Fatal error: Undefined class name ’string’ in /usr/local/cpanel/base/horde/turba/lib/Turba.php on line 168. This error caused by the user having a comma in their address book in Horde.

In order to fix this, you first log in to WHM, after going into phpMyAdmin, navigate to the Horde database. And now click the “Browse” icon next to the turba_objects table.

Look for any entries which have a comma in them, edit this entry and remove it. Now, go back to your customer’s Horde Address book, it should work

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