Kaltura_Client_Exception thrown

Invalid KS "NmE5YjdhMzgyMWQ4NjE2NTkxNTljYTI0YmNjMTY5YmY1M2JkOWZiYnwxMDE7OzE0NzU0MDU0MjU7MjsxNDc1MzE5MDI1LjY2NDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"