If you have any items using the "labeled" view type and then attempt to view that page as one of the conversion types (e.g. .txt, .csv), it instead complains: "unknown view: labeled".
ah, that's because it's only defined for html format. I'll try to get a patch in for this asap.
I've added a code patch for this (currently under review): https://github.com/wagn/wagn/pull/141
this code is live now.