Kaltura_Client_Exception thrown

Invalid KS "ZGYzNGNmZjI0M2U1NjM0NjA4OWZiMDE3MjVmODNiZjM5OGEzNjIyOHwxMDE7OzE0OTMxMDY4NzI7MjsxNDkzMDIwNDcyLjc0NzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"