Kaltura_Client_Exception thrown

Invalid KS "MDMwOTljZmEyMzc5ODc0Yzk0MzRjMmZlNDBmNDY1YTU2MzBlMzJlYnwxMDE7OzE0OTMwMjc1MTc7MjsxNDkyOTQxMTE3LjI1NTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"