Unable to run mattermost

Hi There,

I've been trying to set-up mattermost on an Uubuntu server using the production install guide. I have almost reached the steps until setting up mattermost server and I'm stuck in step 8. Below is the error what I get;

root@ahr-web:/home/ahr/mattermost/bin# ./platform
[17:45:56 MVT 2016/05/10] [INFO] (github.com/mattermost/platform/utils.GetTranslationsBySystemLocale:52) Loaded system translations for 'en' from '/home/ahr/mattermost/i18n/en.json'
[2016/05/10 17:45:56 MVT] [INFO] Current version is 2.2.0 (6671/Fri Apr 15 18:40:19 UTC 2016/8e883ad2f516820942cc0131241268c1ea909ff3)
[2016/05/10 17:45:56 MVT] [INFO] Enterprise Enabled: false
[2016/05/10 17:45:56 MVT] [INFO] Current working directory is /home/ahr/mattermost/bin
[2016/05/10 17:45:56 MVT] [INFO] Loaded config file from /home/ahr/mattermost/config/config.json
[2016/05/10 17:45:56 MVT] [INFO] Server is initializing...
[2016/05/10 17:45:56 MVT] [INFO] Pinging sql master database
[2016/05/10 17:45:56 MVT] [CRIT] Failed to ping db err:Default addr for network '10.1.2.50:5432' unknown
panic: Failed to open sql connection Default addr for network '10.1.2.50:5432' unknown

goroutine 1 0x6, 0xc820259ba0, 0x5, 0xc8202b0660, 0x56, 0xa, 0xa, 0xc8200b5900, 0xc81fffa4d7)
/go/src/github.com/mattermost/platform/store/sql_store.go:169 +0x894
github.com/mattermost/platform/store.NewSqlStore(0x0, 0x0)
/go/src/github.com/mattermost/platform/store/sql_store.go:61 +0x11c
github.com/mattermost/platform/api.NewServer()
/go/src/github.com/mattermost/platform/api/server.go:35 +0xe8
main.main()
/go/src/github.com/mattermost/platform/mattermost.go:67 +0x74d

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1721 +0x1

goroutine 5 /usr/local/go/src/os/signal/signal_unix.go:22 +0x18
created by os/signal.init.1
/usr/local/go/src/os/signal/signal_unix.go:28 +0x37

goroutine 235 0x7f5e34f3a1e8, 0xc820026010)
/go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/termlog.go:33 +0x69
created by github.com/alecthomas/log4go.NewConsoleLogWriter
/go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/termlog.go:26 +0xb5

goroutine 236 /go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/filelog.go:87 +0xabc
created by github.com/alecthomas/log4go.NewFileLogWriter
/go/src/github.com/mattermost/platform/Godeps/_workspace/src/github.com/alecthomas/log4go/filelog.go:119 +0x38b

goroutine 237 /usr/local/go/src/database/sql/sql.go:634 +0x45
created by database/sql.Open
/usr/local/go/src/database/sql/sql.go:481 +0x336

Any advise will be highly appreciated.