The issue is explained at the template: GitHub - ralphtq/elm-land-siteplan: Templates for elm-land
As a newcomer to Elm this might be an obvious issue.
Hi Ralph, from very briefly looking at Sidebar.elm, it looks like you have to change the signature to
viewSidebar : Html Msg
(note the capital “M”). If you write it lowercase, the “msg” is just an unspecified type variable, which basically means that your view isn’t generating any message at all.
The compiler will show you more places where you have to make this change, too, for example the view function.
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