Kaltura_Client_Exception thrown

Invalid KS "YTMwMzc5NzYzZTg0NzljMmVhYzM1M2EwMDg5NjVhMDgwNjNkODgxYnwxMDE7OzE0OTM0MjU2MTE7MjsxNDkzMzM5MjExLjYyNzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"