Kaltura_Client_Exception thrown

Invalid KS "YmI0MzljNjA4ODFjNjUwNjAxNmIyOTAxYjViMGUyMGI5ZWExZGFmYXwxMDE7OzE0NzUyNDk1OTU7MjsxNDc1MTYzMTk1LjExNzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"