Could not compile exception

[vol-lev]

When I tried to mock one of my services: I got a "Could not compile" exception without any details. So there are at least 2 parts of the issue: 1) I want to see the real error to be able to react 2) why I have the compiler error at all

exception> var autoMock = (AutoMocker) NSubstituteAutoMockerBuilder.Build();
var carBrandService = autoMock.ClassUnderTest;