Odoo is the world's easiest all-in-one management software. It includes hundreds of business apps:
CRM | e-Commerce | Accounting | Inventory | PoS | Project management | MRP | etc.
the only way I am aware of to get rid off this (actually it is an add, not a error) without actually signing a contract with Odoo S.A. is by installing this module https://bitbucket.org/BizzAppDev/oerp_no_phoning_home
This also prevents information about your datbase (number of users i.e.) to be transmitted