Upgrading to GitLab Mattermost in GitLab 8.9

Troubleshooting
3

Hi. When upgrading gitlab to 8.9 mattermost was not started.
in /etc/gitlab/gitlab.rbi’ve added
mattermost[‘db2_backup_created’] = true
mattermost[‘db2_team_name’] = “TEAMNAME” with proper teamname.

/var/log/gitlab/mattermost/mattermost.log :

   [2016/06/22 09:24:03 MSK] [EROR] /havana/town-square: code=404 ip=10.46.2.183
   !!!!Automatic database upgrade failed.!!!

    If you are upgrading from Mattermost v2 to v3
    make sure that you have backed up your database
    and then in /etc/gitlab/gitlab.rb set:

    mattermost['db2_backup_created'] = true
    mattermost['db2_team_name'] = TEAMNAME


    where TEAMNAME is the name of the default team.
    Run gitlab-ctl reconfigure again.
    See: 

    http://docs.gitlab.com/omnibus/gitlab-mattermost/#upgrading-gitlab-mattermost-in-gitlab-8.9 

    for more information.

and that’s all.
I was trying to manual run commands above, but get

 $ /opt/gitlab/embedded/bin/mattermost -config='/var/opt/gitlab/mattermost/config.json' -upgrade_db_30
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: interface conversion: interface is runtime.errorString, not string
[signal 0xb code=0x1 addr=0x0 pc=0x78090f]

goroutine 1 [running]:
panic(0xcd1aa0, 0xc820140180)
        /usr/local/go/src/runtime/panic.go:481 +0x3e6
main.doLoadConfig.func1(0xc820167d48)
        /var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:73 +0x6f
panic(0xccbec0, 0xc8200100e0)
        /usr/local/go/src/runtime/panic.go:443 +0x4e9
github.com/mattermost/platform/utils.TestConnection(0xc820080b00)
        /var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/utils/mail.go:82 +0x9f
github.com/mattermost/platform/utils.LoadConfig(0x7fff53bf3794, 0x26)
        /var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/utils/config.go:181 +0x10aa
main.doLoadConfig(0x7fff53bf3794, 0x26, 0x0, 0x0)
        /var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:76 +0x6a
main.main()
        /var/lib/jenkins/jobs/mattermost-platform-release/workspace/src/github.com/mattermost/platform/mattermost.go:84 +0x43

Please help.

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