I found the problem.
Initially I named module as “Titus” and have javscript as “titus.js”.
I renamed like below and it worked.
“titus.js” to “Titus.js”
            {
                    module: 'Titus',
                    position: 'middle_center',
                    header: 'Titus module',
                    config: {
                            text: 'Glory to God, Jesus and Holyspirit, all the time'
                    }
            },
Thank you.
Regards,
Titus S.