Build error in Appharbor - "EnsureBindingRedirects" task terminated unexpectedly

I'm trying to build my first app on appharbor via bitbucket, but the build process failed with the following message.

Build started 12/3/2014 7:22:41 PM.
     1> Project "D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz_git.sln" on node 1 (default targets).
     1> ValidateSolutionConfiguration:
         Building solution configuration "Release | Any CPU".
       The target "MvcBuildViews" listed in a BeforeTargets attribute at "C: \ Program Files (x86) \ MSBuild \ Microsoft \ VisualStudio \ v11.0 \ Web \ Microsoft.Web.Publishing.targets (839,131)" does not exist in the project , and will be ignored.
     1> Project "D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz_git.sln" (1) is building "D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj" (2) on node 1 (default targets).
     2> PrepareForBuild:
         Creating directory "obj \ Release \".
     2> D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97.5): error MSB4018: The "EnsureBindingRedirects" task failed unexpectedly ... [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97.5): error MSB4018: System.IO.FileNotFoundException: Referenced assembly does not exist. [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97,5): error MSB4018: File name: 'D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Net.Http.2.2.28 \ lib \ net45 \ System.Net.Http.Extensions.dll '[D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz. App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97.5): error MSB4018: at Roxel.BuildTasks.EnsureBindingRedirects.d__6. MoveNext () [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97,5): error MSB4018: at System.Linq.Enumerable.WhereSelectEnumerableIterator` 2.MoveNext () [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97,5): error MSB4018: at System.Linq.Enumerable.Any [ TSource] (IEnumerable`1 source) [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97.5): error MSB4018: at Roxel.BuildTasks.EnsureBindingRedirects.Execute ( ) [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97,5): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost. Microsoft.Build.BackEnd.ITaskExecutionHost.Execute () [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
D: \ temp \ n5ivm3kq.n2s \ input \ packages \ Microsoft.Bcl.Build.1.0.21 \ build \ Microsoft.Bcl.Build.targets (97.5): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder. d__20.MoveNext () [D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj]
     2> Done Building Project "D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz.App \ BuzzWiz.App.csproj" (default targets) - FAILED.
     1> Done Building Project "D: \ temp \ n5ivm3kq.n2s \ input \ BuzzWiz_git.sln" (default targets) - FAILED.

Build FAILED.

I've tried a lot of things like updating all culture-neutral dependent assemblies in the web.config or including dlls in the repository or even changing the project file to include Condition.Exists in the Import Project tag, but I keep getting the error.

What am I missing?

Hello