Connection refused while connecting to upstream

I've update gitlab to the latest version- 8.10 and when I try to start workhorse, I get error:

2016/08/13 10:32:02 [error] 1163#0: *6 connect() to unix:/home/git/gitlab/tmp/sockets/gitlab-workhorse.socket failed (111: Connection refused) while connecting to upstream, client: <ip>, server: example.com, request: "POST /ci/api/v1/builds/register.json HTTP/1.1", upstream: "http://unix:/home/git/gitlab/tmp/sockets/gitlab-workhorse.socket:/ci/api/v1/builds/register.json", host: "example.com"

1. all checks passed without errors
2. I copied /home/git/gitlab/lib/support/init.d/gitlab.default.example to /etc/default/gitlab but it didn't help