Kaltura_Client_Exception thrown

Invalid KS "ZjY5ZDc5YjcyZTk2MzNmY2RlYzNlZGY5ZDRjNjU2ZjMwNjk0ODBlZnwxMDE7OzE0OTM0NjcwMDc7MjsxNDkzMzgwNjA3LjUyMDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"