Kaltura_Client_Exception thrown

Invalid KS "NDE1NDkzYTg2OWJhNzljOGU2NjNjN2JkYTdkNDc3MDkxNzY5Y2NmZnwxMDE7OzE0NzU0MzUyMjk7MjsxNDc1MzQ4ODI5LjAwMjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"