Odoo/OpenERP Warning : invalid module names, ignored

Create a new module and new class. After adding 2 variables in class, I tried to restart OpenERP server with following command :

Command : $./openerp-server -u <module_name> -d <db_name>

Example : $./openerp-server -u my_training -d training

Server got started but showed me following warning message on console :

Warning :  invalid module names, ignored

Checked code and followed all necessary steps to check each and everything but was not getting any clue. After some time found a link and ran following command on console :

Command : $./openerp-server -u base -i <module_name> -d <db_name>

Example : $./openerp-server -u base -i my_training -d training

It worked. What this command will do is; it will install all the base modules and update your new module as well.

I feel like this solution is good but not the best. If someone else is having better one please don't hesitate to post as comments.

Thanks!!!!!! Enjoy Programming :)

Reference Link : https://www.odoo.com/forum/Help-1/question/is-Update-Module-List-from-command-line-possible-54578