Kaltura_Client_Exception thrown

Invalid KS "NGNiNTZlMTVmMGYyMzBiOGZlMTNjM2NiMGQxZGIyOWRlNzM2NWUyNnwxMDE7OzE0NzUzNDc3MTc7MjsxNDc1MjYxMzE3LjY4NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"