Kaltura_Client_Exception thrown

Invalid KS "YTM4MTU4NzJlYWNmZjljMGQxODE1NzNjODk5NmZlZDgxYTNkNmViOXwxMDE7OzE0OTM0NzU5MDg7MjsxNDkzMzg5NTA4LjM0MDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"