Adding an address from Horde to Turba fails

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http://forums.cpanel.net – Hello, We just migrated from a cPanel server to another (Server crash) and restored all functionality. There is however one problem with Horde/Turba, and I have no clue how to get that fixed. When reading an email in Horde, and clicking on an email address link to add to to the Addressbook, it gives the error "Invalid address book". Using Turba itself everything is working however. I read the php files, but have no idea where it is going wrong actually. (HowTos)