Kaltura_Client_Exception thrown

Invalid KS "NmYwMTZmODY4NjljYTU0ZDA3N2NmOWE3MTUwN2ZkODY5YjcwY2Q0N3wxMDE7OzE0ODA4NDQ2MTc7MjsxNDgwNzU4MjE3LjkzMDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"