I installed the new yesod-forms-0.2.0 I tried out the sample program hello-forms.hs. The new changes work just fine. No problems. I don't understand some of the notation, but that didn't stop me from using yesod-form prior to the changes. I copied the style of hello-form exactly, I think. But I got a compile error. I don't think the error indicates the actual problem, and I suspect I have left out something. Below is a link to hello-form, the code I am trying to compile and the error I get. I would appreciate any insight offered. hello-forms.hs http://hpaste.org/48177 Handler/SSLvpn.hs http://hpaste.org/48178 error Handler/SSLvpn.hs:43:14: No instance for (RenderMessage Aframe FormMessage) arising from a use of `selectField' Possible fix: add an instance declaration for (RenderMessage Aframe FormMessage) In the first argument of `areq', namely `(selectField tests)' In the second argument of `(<*>)', namely `areq (selectField tests) "Pick a test" Nothing' In the second argument of `($)', namely `pure (,) <*> areq (multiSelectField servers) "Pick some servers" Nothing <*> areq (selectField tests) "Pick a test" Nothing'