No, he can not.
This is from one of the R # developers:
Mar-05-2012
Re: Exception of running NUnit 2.6 tests NUnit 2.6 was released just a few days ago and is not yet supported in ReSharper 6.1.1, since it was released earlier. We are working on NUnit 2.6 support and will be available in future releases.
Blogged in: NUnit 2.6 Test Exception
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