invalid literal for int() with base 10 DetailView Error

[pilamb]

I have managed to view my mongoDB collection in a ListView with success following the tutorial so far.

But when i try to see a detail view, Django trhows:
invalid literal for int() with base 10: '58789fd87608564e074e83c5'

And I have checked that '58789fd87608564e074e83c5' exists on the MongoDB.

Please any help on this?

UPDATE: This issue can be closed. Virtualenv mixed django installations, so when i did a fresh django-nonreal, djangotoolbox and django-mongodb-engine it works now!