Unable to upload logs to Papertrail service?

Question

Ruby on Rails

I am using Ubuntu 16.04. I want to show rail logs on Papertrail service . I did everything as indicated in the instructions:

sudo remote_syslog \ -p 34698 \ -d logs7.papertrailapp.com \ --pid-file=/var/run/remote_syslog.pid \ /home/admin/apps/project/backend/log/development.log

But in the end I get this error:

2018-08-28 04:09:26 CRITICAL remote_syslog.go:240 Failed to start server: No destination hostname specified