Finally I have succeeded to create a working package in Extras-Devel! Just tested it myself and it seems to be working fine.

A very big thanks to Nicolai and MohammadAG. And of course thanks to all who have contributed in this thread.

I uninstalled the manually installed package and installed through App Manager. If you wish to do the same then uninstall running this command as root:Otherwise just update with App Manager.

Please test and if you like this app, please promote it.