Kaltura_Client_Exception thrown

Invalid KS "OTA5NjNlMjU2NGM0Yjk3MDA5Yjg0N2M0NDEzNjBkYmQzNzY0NDllZnwxMDE7OzE0NzUyNjE5NDc7MjsxNDc1MTc1NTQ3LjU2NzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"