VS2010, .NET 4.0, MSBuild - problem with aspnet_compiler

Hi,

I've run into a problem after upgrading one of our projects to .NET 4.0.

It fails during compilation in Team City with the following error message:

"web.config(19, 0): error ASPCONFIG: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive."

The attribute is set on the compilation element in web.config:

<compilation debug="true" targetFramework="4.0">
 </compilation>


I checked the full build log and I found this for the aspnet_compiler:
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_compiler.exe -v /ProjectName.csproj -p D:\BuildAgent\work\fe9e7aef8b7978f4\SolutionName\ProjectName-u -f -c -d .\TempBuildDir\

The build configuration is set up as:
Runner: MSBuild
MSBuild version: Microsoft .NET Framework 4.0
MSBuild ToolsVersion: 4.0

The msbuild script also has ToolsVersion="4.0" specified on the Project element.

The project builds perfectly fine if I use the sln runner, where the full build log then contains:
C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe -v /ProjectName.csproj -p D:\BuildAgent\work\fe9e7aef8b7978f4\SolutionName\ProjectName-u -f -c -d .\TempBuildDir\

[edit]
The build is set up in the script as:

<MSBuild Projects="SolutionName.sln" ContinueOnError="false" Properties="Configuration=$(Configuration)">
      <Output ItemName="BuildOutput" TaskParameter="TargetOutputs" />
</MSBuild>

so it's just plain building the solution with MSBuild. The reason I want it to work with MSBuild instead of going with the sln runner is that we have deployment set up in the script as well
[/edit]



Any idea how to fix this, or is it a bug in Team City? (Still on 5.1, but in the process of getting it up to 5.1.2 today)

Message was edited by: Geir-Tore Lindsve. Added some additional info