Kaltura_Client_Exception thrown

Invalid KS "ZGQwYmUzZWRmZjQ4MGRkMmYxMzgyZDBkZjBmZDEyZjE3MjFmZTMwMnwxMDE7OzE0NzAwMzY3MDY7MjsxNDY5OTUwMzA2Ljk4NDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"