Today I started a new Episerver project and this issue always hunt me

Server Error in ‘/’ Application.

There is no build provider registered for the extension ‘.cshtml’. You can register one in the <compilation><buildProviders> section in machine.config or web.config. Make sure is has a BuildProviderAppliesToAttribute attribute which includes the value ‘Web’ or ‘All’.

After dig a little bit, a found the solution

Open web.config

Look for the following line :

<compilation debug=”true” targetFramework=”4.7.2″ optimizeCompilations=”true” />

change the parameter optimizeCompilations to false and be happy !