help with rss feed ImproperlyConfigured

hi, i am trying to implement the syndicate feed framework simple rss with my program, but i get a 

ImproperlyConfigured at /latest/feed/

Give your Debt class a get_absolute_url() method, or define an item_link() method in your Feed class.

I know i am supposed to create a get_absolute_url in my Debt model, but i dont know how to do it (already seen tutorials but cant make it work)

model: 

class Debt (models.Model): 

 user = models.ForeignKey(User) 

 debt_name = models.TextField() 

 creation_date = models.DateTimeField('date created') 

 due_date = models.DateTimeField('due date') 

 info = models.TextField() 

 is_owing = models.BooleanField() 

 is_payed = models.BooleanField()

 def __unicode__(self):          return self.debt_name

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