Kaltura_Client_Exception thrown

Invalid KS "YjViNzhmZTE1NjU2MTU0YTJhZTNhZmVmMDQ5ZTVhYjZiNDRlZTVjY3wxMDE7OzE0NzUxNTc4MzA7MjsxNDc1MDcxNDMwLjg4MDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"