Connection already opened about tornadis HOT 3 CLOSED

import tornado
from tornado.web import RequestHandler, Application, url
import tornadis

class GetHandler(RequestHandler):

    @tornado.gen.coroutine
    def get(self):
        client = tornadis.Client(port=6379)
        yield client.connect()
        yield client.call("BLPOP", "empty", 3)
        self.finish()


app = Application([url(r"/", GetHandler)])
app.listen(8888)
tornado.ioloop.IOLoop.current().start()