504 Gateway Time-out

Hello. I installed Redash on Ubuntu 18.04 using the script:

git clone https://github.com/getredash/setup.git
cd setup
chmod +x setup.sh
./setup.sh

Then I went to the server IP and got a 504 Gateway Time-out error.

There is an error in the log (docker-compose logs):

scheduled_worker_1  |   File "/usr/local/lib/python2.7/site-packages/kombu/transport/redis.py", line 829, in get_table
scheduled_worker_1  |     raise InconsistencyError(NO_ROUTE_ERROR.format(exchange, key))
scheduled_worker_1  | OperationalError:
scheduled_worker_1  | Cannot route message for exchange 'reply.celery.pidbox': Table empty or key no longer exists.
scheduled_worker_1  | Probably the key (u'_kombu.binding.reply.celery.pidbox') has been removed from the Redis database.