[nant-dev] Solution task

Title: Solution task I'm a new to nant, I' m trying to use solution task to be able to build  a dotnet project , here is my build file          Here is the output. build:  [solution] Starting solution build. BUILD FAILED INTERNAL ERROR S

[nant-dev] (no subject)

Any idea why I'm getting this error ? Thanks. INTERNAL ERROR System.ArgumentNullException: Value cannot be null. Parameter name: path1    at System.IO.Path.Combine(String path1, String path2)    at NAnt.VisualCpp.Tasks.McTask.ExecuteTask()    at NAnt.Core.Task.Execute()    at NAn