Kaltura_Client_Exception thrown

Invalid KS "NGE2MzViMzIwYTE4MzU5MWVlN2QxOGRhZTJhYmUzNmJlNzk0NmI2OXwxMDE7OzE0NzUxMTU3MDA7MjsxNDc1MDI5MzAwLjg2NDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"