Kaltura_Client_Exception thrown

Invalid KS "ZTcxMjNjNjgxNDk2NWI5YzFhMzE0NjA0MzA5ZGZhYmIxNjcwNjBlZHwxMDE7OzE0ODEyNTAwMjg7MjsxNDgxMTYzNjI4LjY2OTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"