Getting lots of warnings when building with targets in Visual Studio 2010

Question

I'm trying to build some code but getting lots of warnings in target files, stuff like this:

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'.

Any ideas how I could fix these?

Answer 1

I had this problem too. After some googling, found a suggestion to close all the editor windows in VS, and then rebuild.

Worked for me.