msbuild - UnitTestFramework reference could not be resolved

Question

I'm trying to run msbuild in Jenkins. When it reaches the UniTest-Project an error occures:

Project "C:\Program Files (x86)\Jenkins\jobs\***\workspace\***.sln" (1) is building "C:\Program Files (x86)\Jenkins\jobs\***\workspace\***.unitTests\***.unitTests.csproj" (4) on node 0 (default targets).
Project file contains ToolsVersion="4.0", which is not supported by this version of MSBuild. Treating the project as if it had ToolsVersion="3.5".
ResolveAssemblyReferences:
  Primary reference "Microsoft.VisualStudio.QualityTools.UnitTestFramework, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL".
      Could not find dependent files. Could not load file or assembly 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\PublicAssemblies\Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.
C:\Windows\Microsoft.NET\Framework\v3.5\Microsoft.Common.targets : warning MSB3245: Could not resolve this reference. Could not locate the assembly "Microsoft.VisualStudio.QualityTools.UnitTestFramework, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.
          For SearchPath "{Registry:Software\Microsoft\.NetFramework,v4.0,AssemblyFoldersEx}".
          Considered "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VSTSDB\Microsoft.VisualStudio.QualityTools.UnitTestFramework.exe", but it didn't exist.
          Considered "C:\Program Files (x86)\Microsoft Visual Studio 10.0\VSTSDB\Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll", but it didn't exist.
          Considered "C:\Program Files (x86)\Reference Assemblies\Microsoft\FSharp\2.0\Runtime\v4.0\Microsoft.VisualStudio.QualityTools.UnitTestFramework.exe", but it didn't exist.
          Considered "C:\Program Files (x86)\Reference Assemblies\Microsoft\FSharp\2.0\Runtime\v4.0\Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll", but it didn't exist.
          Considered "C:\Program Files (x86)\MySQL\MySQL Connector Net 6.3.6\Assemblies\v2.0\Microsoft.VisualStudio.QualityTools.UnitTestFramework.exe", but it didn't exist.
          Considered "C:\Program Files (x86)\MySQL\MySQL Connector Net 6.3.6\Assemblies\v2.0\Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll", but it didn't exist.
          Considered "C:\Program Files (x86)\MySQL\MySQL Connector Net 6.3.6\Assemblies\v4.0\Microsoft.VisualStudio.QualityTools.UnitTestFramework.exe", but it didn't exist.
          Considered "C:\Program Files (x86)\MySQL\MySQL Connector Net 6.3.6\Assemblies\v4.0\Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll", but it didn't exist.
          Considered "C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\Microsoft.VisualStudio.QualityTools.UnitTestFramework.exe", but it didn't exist.
          Considered "C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\Microsoft.VisualStudio.QualityTools.UnitTestFramework.dll", but it didn't exist.
          Considered "C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\PublicAssemblies\Microsoft.VisualStudio.QualityTools.UnitTestFramework.exe", but it didn't exist.
CalculatorServiceTest.cs(1,17): error CS0234: The type or namespace name 'VisualStudio' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?)
CalculatorServiceTest.cs(11,10): error CS0246: The type or namespace name 'TestMethod' could not be found (are you missing a using directive or an assembly reference?)
CalculatorServiceTest.cs(11,10): error CS0246: The type or namespace name 'TestMethodAttribute' could not be found (are you missing a using directive or an assembly reference?)
CalculatorServiceTest.cs(24,10): error CS0246: The type or namespace name 'TestMethod' could not be found (are you missing a using directive or an assembly reference?)
CalculatorServiceTest.cs(24,10): error CS0246: The type or namespace name 'TestMethodAttribute' could not be found (are you missing a using directive or an assembly reference?)
CalculatorServiceTest.cs(37,10): error CS0246: The type or namespace name 'TestMethod' could not be found (are you missing a using directive or an assembly reference?)
CalculatorServiceTest.cs(37,10): error CS0246: The type or namespace name 'TestMethodAttribute' could not be found (are you missing a using directive or an assembly reference?)
CalculatorServiceTest.cs(6,6): error CS0246: The type or namespace name 'TestClass' could not be found (are you missing a using directive or an assembly reference?)
CalculatorServiceTest.cs(6,6): error CS0246: The type or namespace name 'TestClassAttribute' could not be found (are you missing a using directive or an assembly reference?)
Done Building Project "C:\Program Files (x86)\Jenkins\jobs\***\workspace\***.unitTests\***.unitTests.csproj" (default targets) -- FAILED.
Done Building Project "C:\Program Files (x86)\Jenkins\jobs\***\workspace\***.sln" (default targets) -- FAILED.

Build FAILED.

Any suggestions what the problem could be? Running ms build from the command works for the solution and without any additional parameters when the project was compiles in VS bevor. After a clean solution the same errors occur. Must be some parameter or reference problem; Line two talks bout v4 and v3.5 problems; but i can't figure out how to solve this.

Greets

Answer 1

Error info directly shows that you use incorrect version of MSBuild

This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

Try to rebuild with MSBuild 4.0

 C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe *.sln /t:rebuild

OR/AND from VS2010 Command Line.