Isolate.Fake.Instance<InternalClass>() not wor

In Assembly "A", define a internal class

internal abstract class InternalClass
{
} 

In the "A" assemblyinfo.cs, make sure that Assembly "B" can see the internal of "A"

[assembly: InternalsVisibleTo("B")]

"B" is the test class of "A".

In "B", try to use this command:

 Isolate.Fake.Instance<A>()

Although the code can compile, but it fails under Isolator because of System.TypeLoadException.

This, I think is a bug because I usually use

[assembly: InternalsVisibleTo("UnitTest")]

pattern for my unit testing class
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