I'm getting this error while using nunit. What could be the reason? It was working with .net framework 3.5 not with framework 4.
I did update nunit DLLs from nant web site, but it is still saying the same. I just updated the nant.nunit.dll, nant.nunit1tasks.dll, nant.nunit2tasks.dll and same with XML file. But it is still failing.