Microsoft Fakes can't find the `ICollection` and `IDictionary` interfaces

MS Visual Studio 2015 Enterprise.

I am learning Microsoft Fakes Framework. I have two assemblies AcDbMng.dll and AcMng.dll are written by other company. They use .Net Framework 2.0. I create new Unit Test Project, add these assemblies into my project, and through their context menu call the "Add Fakes Assembly". Now I launch my project building and get 128 errors... For example:

It wasn't succeeded to find type or a name of a name space of "ICollection" (perhaps, there is no directive of using or an assembly reference). [c:\users\andrey\documents\visual studio 2015\Projects\msfakes\obj\Debug\Fakes\adm\f.csproj] msfakes c:\users\andrey\documents\visual studio 2015\Projects\msfakes\f.cs 206092

It wasn't succeeded to find type or a name of a name space of "IDictionary" (perhaps, there is no directive of using or an assembly reference). [c:\users\andrey\documents\visual studio 2015\Projects\msfakes\obj\Debug\Fakes\adm\f.csproj] msfakes c:\users\andrey\documents\visual studio 2015\Projects\msfakes\f.cs 206119

The modifier "override" is not valid for this item. [c: \ users \ andrey \ documents \ visual studio 2015 \ Projects \ msfakes \ obj \ Debug \ Fakes \ adm \ f.csproj] msfakes c: \ users \ andrey \ documents \ visual studio 2015 \ Projects \ msfakes \ f. cs 206119

Such error messages are not clear for me. I tried to change the target .Net Framework platform: .Net 4.6 and .Net 3.5, but I get the same messages.

ICollection, IDictionary, modifier "override... I didn't understand, what relation they have to these assemblies, because they are defined in the platform assemblies instead of AcDbMng.dll and AcMng.dll.

Anybody has idea about such behaviour?