No idea. On the few occasions I've used Catalyst, I never had much need for Catalyst::Model. But that's what the error message is saying.

Can't call method "find" on an undefined value

... means that you're effectively trying to do this:

undef->find($id)

So the only thing that could be happening is that the model method is returning undef.

If you don't believe me, run the following Perl one-liner at the command line...

perl -e'undef->find(1)'

And verify that you get the exact same error message.