Resharper 5: wrong error in a test method.

Hello,

I have a project #1 and a test project #2 for that #1.

The situation is as following:

In the test method I call a method of the project #1 and see the error:

This is the method declaration in the project #1:

While the Resharper shows the error, the actual program compilation succeeds.
Updating the Test Reference does not help.

Thank you.