Build Error

Errors:

/root/buildzone/opensim/OpenSim.sln (default targets) ->
(Build target) ->
/root/buildzone/opensim/OpenSim/Tests/Common/OpenSim.Tests.Common.csproj (default targets) ->
/usr/lib/mono/4.5/Microsoft.CSharp.targets (CoreCompile target) ->

Mock/TestHttpClientContext.cs(79,23): error CS0102: The type `OpenSim.Tests.Common.TestHttpClientContext' already contains a definition for `SSLCommonName'
Mock/TestHttpClientContext.cs(84,23): error CS0102: The type `OpenSim.Tests.Common.TestHttpClientContext' already contains a definition for `SSLCommonName'
Mock/TestHttpClientContext.cs(89,23): error CS0102: The type `OpenSim.Tests.Common.TestHttpClientContext' already contains a definition for `SSLCommonName'
Mock/TestHttpClientContext.cs(94,23): error CS0102: The type `OpenSim.Tests.Common.TestHttpClientContext' already contains a definition for `SSLCommonName'
Mock/TestHttpClientContext.cs(99,23): error CS0102: The type `OpenSim.Tests.Common.TestHttpClientContext' already contains a definition for `SSLCommonName'

98 Warning(s)
5 Error(s)

Any Idea what I am doing wrong?