Hello I create a custom bpartner module with a custom field x_note2 extending also the view res.partner.form using an xml file

Now I would like to remove this custom module but I got an error:

File "/opt/odoo/openerp/addons/base/ir/ir_ui_view.py", line 360, in raise_view_error
    raise AttributeError(message)
AttributeError: Field `x_note2` does not exist

Error context:
View `res.partner.form`
[view_id: 126, xml_id: base.view_partner_form, model: res.partner, parent_id: n/a]

How can I clean the database ?

Best regards