Create a facebook notification with Django package facepy : [15] (#15) This method must be called with an app access_token

I'm trying to create a facebook notifications with facepy & fandjango but I'm constantly get the same Error,

@facebook_authorization_required
@csrf_exempt     
def notify_self(request):

     token = request.facebook.user.oauth_token.token #user token
     token_app=facepy.utils.get_application_access_token('APP_ID','APP_SECRET_ID') 
     graph = GraphAPI(token)
     graph.post(
        path = 'me/notifications',
        template = '#Text of the notification',
        href = 'URL',
        access_token= token_app
     )

     return HttpResponse('<script type=\'text/javascript\'>top.location.href = \'URL\';</script>')<code>

When I Check the app access_token on https://developers.facebook.com/tools/debug/ it said that it's a valid token (I get back my APP's ID)

I also try with

graph = GraphAPI(token_app)

but it send me:

[2500] An active access token must be used to query information about the current user.

my app have all the permission that I need, I search for a while but didn't find any help so I'm asking here.

Edit: The correct Code is

@facebook_authorization_required
@csrf_exempt     
def notify_self(request):
   token_app=facepy.utils.get_application_access_token('APP_ID','APP_SECRET_ID') 
   graph = GraphAPI(token_app)
   graph.post(
      path = 'me/notifications',
      template = '#Text of the notification',
      href = 'URL'
   ) 

   return HttpResponse('<script type=\'text/javascript\'>top.location.href = \'URL\'</script>')

thanks to joaopsf

Solution

Finally I found where was the issues. when I was trying with

graph = GraphAPI(token_app)

I was on the good way, the only things to do was to delete

access_token= token_app

the token is saved when at the instruction GraphAPI(token_app) so there is no need to give it again.

The correct code is :

@facebook_authorization_required
@csrf_exempt     
def notify_self(request):

   token = request.facebook.user.oauth_token.token #user token
   token_app=facepy.utils.get_application_access_token('APP_ID','APP_SECRET_ID') 
   graph = GraphAPI(token)
   graph.post(
      path = 'me/notifications',
      template = '#Text of the notification',
      href = 'URL',
      access_token= token_app
   ) 

   return HttpResponse('<script type=\'text/javascript\'>top.location.href = \'URL\'</script>')

Hope that will help someone