CS0234 - and many more... broken umbraco

Questions
1

Hi,
I downloaded umbraco, installed, it ran the first time with IIS Express, just one run and then this happens. Umbraco does not run the second time.

Severity Code Description Project File Line Suppression State
Error CS0234 The type or namespace name ‘Home’ does not exist in the namespace ‘Umbraco.Web.PublishedModels’ (are you missing an assembly reference?) 1_Views_home.cshtml C:\Users\Janooo\source\repos\umbraco\Views\home.cshtml 1 Active

… and many more errors.
What is wrong?

Thanks,

Jano

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This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/105556-cs0234-and-many-more-broken-umbraco