Kaltura_Client_Exception thrown

Invalid KS "ZmE0MGFiNzMxMjk0N2Y4YjIzZWM5MTIwODZkODM4NDY1MTgzZjA3ZHwxMDE7OzE0NzUwNzgwNTA7MjsxNDc0OTkxNjUwLjU2NzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"