New Language module doesn't install

I am developing a language module (Brazilian Portuguese). The module has been developed using strictly the steps on the UNA tutorial.

When I try to install it, an error is raised: An error occurred. Contact with module's vendor.

Anyway an Icon is put in Launcher area, but open system information. It isn't possible uninstall operation about the icon as an error is raised too. You must manually delete it from the database to fix such a thing.

The installation process put entries in all tables of the install.sql, however I didn't find any entry in sys_module table.

Any suggestion or idea? Thanks in advance!