Hello, you need not add these values in system parameters,only need to add the path app in your config file data directory, the variable is "data_dir" and assign your Odoo directory, example:

data_dir = /home/opt/odoo9/server/openerp/odoo_file/

And set chmod 777 and chown openerp to the folder, example:

chmod 777 data_dir = /home/opt/odoo9/server/openerp/odoo_file/

then restar your server:

sudo service odoo-server restart

best regards