I have this error when i want to install any module on odoo 9

can you help me please

this is the server error:

 File "/odoo/odoo-9.0c-20170217/openerp/fields.py", line 1718, in convert_to_write
    return value.id
AttributeError: 'int' object has no attribute 'id'

this is the part of my code fields.py:

    def convert_to_write(self, value):
        return value.id

    def convert_to_export(self, value, env):
        return value.name_get()[0][1] if value else ''

    def convert_to_display_name(self, value, record=None):
        return ustr(value.display_name)

    def convert_to_onchange(self, value, fnames=None):
        if not value.id:
            return False
        return super(Many2one, self).convert_to_onchange(value, fnames)