Sometimes you may encounter an error in development or production [Errno 98] Address already in use.
This error is due to openerp-service or some other service already use port defined in your Odoo config.
You could try to change the port 8069 to any other port and restart the server but that’s not the right way.
Just apply the command
sudo ps aux | grep openerp
which will show you the port on which openerp server is in running state.
Then kill the specific process.
sudo kill -9 id
For example sudo kill -9 999
Restart odoo server and that’s it.