Kaltura_Client_Exception thrown

Invalid KS "MjRjNjk5NjVmZmM5NGE5ZmZkNWZlYWM5ODU0ZTg1YjVhMjU3ZDQxMHwxMDE7OzE0Njk0NzI5MTQ7MjsxNDY5Mzg2NTE0LjcwMTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"