Kaltura_Client_Exception thrown

Invalid KS "ZmVkZjQyMzQwOTM1ZTBhMjVmZGNlOGVhNDAzOTNiZTgzYmRhMThkZnwxMDE7OzE0OTU3Njg3MjQ7MjsxNDk1NjgyMzI0LjEwMTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"