Kaltura_Client_Exception thrown

Invalid KS "Y2NlYTFiZThlODgzZmVhYmRhYmVhMjVhOGVjMTA5ODY2MTEzMTlhM3wxMDE7OzE0OTU2NDUxMTM7MjsxNDk1NTU4NzEzLjQ3NzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"