Add mail to depends in __openerp__.py

res_partner_mails_count/__openerp__.py

@@ -20,7 +20,7 @@
     'version': '0.1',
 
     # any module necessary for this one to work correctly
-    'depends': ['base', 'mail_sent'],
+    'depends': ['base', 'mail'],
 
     # always loaded
     'data': [

res_partner_mails_count/templates.xml

@@ -6,7 +6,6 @@
             <field name="model">res.partner</field>
             <field name="inherit_id" ref="base.view_partner_form"/>
             <field name="priority" eval="50"/>
-            <field name="groups_id" eval="[(4, ref('project.group_project_user'))]"/>
             <field name="arch" type="xml">
                 <xpath expr="//div[@name='buttons']" position="inside">
                     <button class="oe_inline oe_stat_button" type="action"