Resharper 5.1 fails to run unit tests if pointed to external nunit of different version

I see this message. My resharper pointed to the nunit 2.5.9 explicitly. How do i sort this?

also, i see resharper loads assemblies twice (both bundled 2.5.7 and pointed 2.5.9) and fails later:

'JetBrains.ReSharper.TaskRunner.CLR4.MSIL.exe' (Managed (v4.0.30319)): Loaded 'C:\usr\JetBrains\ReSharper\v5.1\Bin\nunit.core.interfaces.dll'
'JetBrains.ReSharper.TaskRunner.CLR4.MSIL.exe' (Managed (v4.0.30319)): Loaded 'C:\usr\JetBrains\ReSharper\v5.1\Bin\nunit.core.dll'
'JetBrains.ReSharper.TaskRunner.CLR4.MSIL.exe' (Managed (v4.0.30319)): Loaded 'C:\usr\JetBrains\ReSharper\v5.1\Bin\nunit.util.dll'
'JetBrains.ReSharper.TaskRunner.CLR4.MSIL.exe' (Managed (v4.0.30319)): Loaded 'C:\usr\NUnit.2.5.9\bin\net-2.0\lib\nunit.core.dll'
'JetBrains.ReSharper.TaskRunner.CLR4.MSIL.exe' (Managed (v4.0.30319)): Loaded 'C:\usr\NUnit.2.5.9\bin\net-2.0\lib\nunit.core.interfaces.dll'
'JetBrains.ReSharper.TaskRunner.CLR4.MSIL.exe' (Managed (v4.0.30319)): Loaded 'C:\usr\NUnit.2.5.9\bin\net-2.0\lib\nunit.util.dll'
'JetBrains.ReSharper.TaskRunner.CLR4.MSIL.exe' (Managed (v4.0.30319)): Loaded 'C:\usr\NUnit.2.5.9\bin\net-2.0\addins\Addins.dll', Symbols loaded.
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

i've filed an issue for this - http://youtrack.jetbrains.net/issue/RSRP-210800

Message was edited by: Alexander Ashitkin