title: Getting lots of warnings when building with targets in Visual Studio 2010
body: <p>I'm trying to build some code but getting lots of warnings in target files, stuff like this:</p>
  
  <pre><code>Warning 12  The element 'ItemGroup' in namespace 'http://schemas.microsoft.com/developer/msbuild/2003' 
  has invalid child element 'TCS_Compile' in namespace 'http://schemas.microsoft.com/developer/msbuild/2003'. 
  List of possible elements expected: 
  'Item, Reference, COMReference, COMFileReference, Xdcmake, Bscmake, ClCompile,
   ClInclude, Midl, ResourceCompile, PreLinkEvent, CustomBuildStep, Manifest, 
  ProjectConfiguration, NativeReference, ProjectReference, Compile, EmbeddedResource, 
  Content, Page, Resource, ApplicationDefinition, None, BaseApplicationManifest, 
  Folder, Import, Service, WebReferences, WebReferenceUrl, FileAssociation, 
  BootstrapperFile, PublishFile, CodeAnalysisDependentAssemblyPaths, 
  CodeAnalysisDictionary, CodeAnalysisImport, Link, ResourceCompile, PreBuildEvent, 
  PostBuildEvent' 
  in namespace 'http://schemas.microsoft.com/developer/msbuild/2003'.
  </code></pre>
  
  <p>Any ideas how I could fix these?</p>