Go to http://faq.cpanel.net/list.cgi

You will get there faq The Address Book in Horde returns an error "There was an error adding this object" ?

or(not from faq) error could be "An error has occurred, pls contact to your sys admin"

Use same solution, that is also given below.
Actually you need to check whether table turba_objects is present in horde database. If it is not present create it by using following :


SSH to the server as root. Type `mysql` to get the mysql prompt and cut and paste the following:

CREATE TABLE horde.turba_objects (object_id varchar(32) PRIMARY KEY,owner_id varchar(255),object_name varchar(255),object_alias varchar(32),object_email varchar(255),object_homeAddress varchar(255),object_workAddress varchar(255),object_homePhone varchar(25),object_workPhone varchar(25),object_cellPhone varchar(25),object_fax varchar(25),object_title varchar(32), object_company varchar(32),object_notes text);

After that has been entered the address book (turba objects) should work again.