Does anyone tries to call o return a Diagram view? - odoo-10

Question

I'm trying to return a Diagram view but I got an Access Error, I'm using Odoo .v10:
But my user has the proper access permission, even with the admin user I got the same access error.
This is my code:
ir.model.access.csv
id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
access_montecarlo_project,montecarlo.project,model_montecarlo_project,group_montecarlo_user,1,1,1,1
access_montecarlo_sprint,montecarlo.sprint,model_montecarlo_sprint,group_montecarlo_user,1,1,1,1
access_montecarlo_activity,montecarlo.activity,model_montecarlo_activity,group_montecarlo_user,1,1,1,1
access_montecarlo_activity_transition,montecarlo.activity.transition,model_montecarlo_activity_transition,group_montecarlo_user,1,1,1,1
access_montecarlo_project_result,montecarlo.project.result,model_montecarlo_project_result,group_montecarlo_user,1,1,1,1
My .py code to return the the diagram view, in a button type object, and action too:
#api.multi
def show_diagram(self):
# TODO: Create a group with the permisitions to montecarlo.sprint to the user of
# that group can see the diagram view
self.ensure_one()
view_mode = 'diagram'
view_diagram_id = self.env.ref('montecarlo.montecarlo_sprint_diagram_view').id
res_id = False
domain = [('id','=',self.id)]
context = {}
return {
'name': u"Activities",
'type': 'ir.actions.act_window',
'view_mode': view_mode,
'res_model': 'montecarlo.sprint',
'target': 'self',
'views': [(view_diagram_id, 'diagram')],
'view_id': view_diagram_id,
'res_id': res_id,
'domain': domain,
'context': context,
}
And this is the console log when I press my button:
2018-01-18 02:10:10,807 14185 INFO montecarlo werkzeug: 127.0.0.1 - - [18/Jan/2018 02:10:10] "POST /web/dataset/call_button HTTP/1.1" 200 -
2018-01-18 02:10:10,850 14185 WARNING montecarlo odoo.models: montecarlo.sprint.read() with unknown field 'activity_to_id'
2018-01-18 02:10:10,852 14185 WARNING montecarlo odoo.models: montecarlo.sprint.read() with unknown field 'duration'
2018-01-18 02:10:10,852 14185 WARNING montecarlo odoo.models: montecarlo.sprint.read() with unknown field 'activity_from_id'
2018-01-18 02:10:10,854 14185 INFO montecarlo werkzeug: 127.0.0.1 - - [18/Jan/2018 02:10:10] "POST /web/dataset/call_kw/montecarlo.sprint/read HTTP/1.1" 200 -
2018-01-18 02:10:10,882 14185 INFO montecarlo werkzeug: 127.0.0.1 - - [18/Jan/2018 02:10:10] "POST /web/dataset/call_kw/montecarlo.sprint/search_read HTTP/1.1" 200 -
2018-01-18 02:10:10,920 14185 INFO montecarlo werkzeug: 127.0.0.1 - - [18/Jan/2018 02:10:10] "POST /web/dataset/search_read HTTP/1.1" 200 -
2018-01-18 02:10:10,931 14185 INFO montecarlo werkzeug: 127.0.0.1 - - [18/Jan/2018 02:10:10] "POST /web/dataset/call_kw/montecarlo.activity/read HTTP/1.1" 200 -
Let me know if you need more details of my code.
EDIT:
This is the .py models:
class Sprint(models.Model):
_name='montecarlo.sprint'
name = fields.Char('Name', required=True)
activities_ids = fields.One2many('montecarlo.activity', 'sprint_id', string='Activities')
project_id = fields.Many2one('montecarlo.project', 'Project', required=True)
class Activity(models.Model):
_name='montecarlo.activity'
name = fields.Char('Short Name')
duration = fields.Integer('Duration(weeks)',
help='Duration of the activity, on weeks.', required=True)
start = fields.Boolean('Start', help="This activity is the root of the Sprint.", index=True)
sprint_id = fields.Many2one('montecarlo.sprint', 'Sprint Name')
from_ids = fields.One2many('montecarlo.activity.transition', 'activity_to_id', string='Previous Activities')
to_ids = fields.One2many('montecarlo.activity.transition', 'activity_from_id', string='Next Activities')
class ActivityTransition(models.Model):
_name='montecarlo.activity.transition'
name = fields.Char('Description')
activity_from_id = fields.Many2one('montecarlo.activity', 'Previous Activity', required=True, ondelete="cascade")
activity_to_id = fields.Many2one('montecarlo.activity', 'Next Activity', required=True, ondelete="cascade")
And this is the Diagram view xml:
<!-- Sprint Diagram View -->
<record id="montecarlo_sprint_diagram_view" model="ir.ui.view">
<field name="name">montecarlo.sprint.diagram.view</field>
<field name="model">montecarlo.sprint</field>
<field name="arch" type="xml">
<diagram string="Project Editor">
<node object="montecarlo.activity" bgcolor="gray:start==True">
<field name="name" />
<field name="duration" />
</node>
<arrow object="montecarlo.activity.transition" source="activity_from_id" destination="activity_to_id" label="['name']">
<field name="activity_from_id" />
<field name="activity_to_id" />
</arrow>
</diagram>
</field>
</record>
Thanks.