Kaltura_Client_Exception thrown

Invalid KS "Yjc1NmFjMWNkOWQ0ZDdhNDE2MWI1OGNmZTE1NWVhODJlODc0YWJlN3wxMDE7OzE0OTgzMDA4OTM7MjsxNDk4MjE0NDkzLjg3NzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"