Kaltura_Client_Exception thrown

Invalid KS "ZjQzMjNiZDBjM2Y2YjZlZjdlZGJjMTFiNTc2YzM5NWVlMDU3NTc3YXwxMDE7OzE1MDExMDk1NTA7MjsxNTAxMDIzMTUwLjI0NzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"