Kaltura_Client_Exception thrown

Invalid KS "NDI2NjkyYjE5NjE2MDEwOGIzNGU3ZWFhMWI3ODFiZDZlNzRkOWVjYnwxMDE7OzE0ODc4MzkyMDI7MjsxNDg3NzUyODAyLjg0MjI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"