Kaltura_Client_Exception thrown

Invalid KS "ZjRlMThhNzAwNjI2YzIyNjc0ZjU1ZmE2YmQ3ZjFiZTcyODI4YTE3ZXwxMDE7OzE0ODUzMTQ3Nzk7MjsxNDg1MjI4Mzc5LjMyMzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"