Kaltura_Client_Exception thrown

Invalid KS "ZjI4Yjk5YTAwZDAzMGZhMDQyNjRiZmE5ZDk0NWM4Zjk1NTVjNzQ2NXwxMDE7OzE0NzUwMTAzNzQ7MjsxNDc0OTIzOTc0LjkxMTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"