found a solution here

For me I edited the openerp-server (--update=website) and deploy again.

practically:  

sudo service odoo-server stop

su odoo || cd /opt/odoo/odoo-server

./openerp-server --update=website

exit

sudo service odoo-server start

it seems the entire process (git pull AND the reloading of modules) has caused at least 2 Module ("oerp_no_phoning_home" and a custom Module 9adding additional fields to employees) to stop working

I had done an "./openerp-server -u all" at first but that hung itself up during the process. There was an error message about those 2 modules and now both of them seem not to work anymore now. I am not sure whether that maybe a git-pull is not the way to update, or maybe the firstly ran 'openerp-server -u all' was a bad idea

######### UPDATE #############

after restarting the odoo-server with sudo service odoo-server restart the 2 modules mentioned above are working again