I'm trying to set up a nightly build for one of my company's products. When I execute the build, it fails after 45 or so seconds, giving the error "Error parsing the nested project section in solution file.

This is the log from the build:

Delete Binaries Directory

00:17 Delete Workspace

00:00 Delete Sources Directory

00:00 Create Workspace

00:18 Get Workspace

00:01 Create Label Label [label]
(version W60_2_VMCORPTFS01;CL\me) was
successfully created.

00:04 Compile, Test, and Associate
Changesets and Work Items

00:04 Compile and Test

00:03 Run MSBuild for Project
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
/nologo /noconsolelogger
"e:\localstore\Productname_2.0\Product\Product.sln"
/m:1 /fl
/flp:"logfile=e:\localstore\ThisSpecificBuild\Product\Product.log;encoding=Unicode;verbosity=normal"
/p:SkipInvalidConfigurations=true
/p:OutDir="C:\Builds\2\Product\ThisSpecificBuild\Binaries\"
/p:Configuration="Debug"
/p:Platform="Any CPU"
/p:VCBuildOverride="e:\localstore\Productname_2.0\Product\Product.sln.Any
CPU.Debug.vsprops"
/dl:WorkflowCentralLogger,"C:\Program
Files\Microsoft Team Foundation Server
2010\Tools\Microsoft.TeamFoundation.Build.Server.Logger.dll";"Verbosity=Normal;BuildUri=vstfs:///Build/Build/2934;InformationNodeId=1175609;TargetsNotLogged=GetNativeManifest,GetCopyToOutputDirectoryItems,GetTargetPath;TFSUrl=http://localhost:8080/tfs/DefaultCollection;"*WorkflowForwardingLogger,"C:\Program
Files\Microsoft Team Foundation Server
2010\Tools\Microsoft.TeamFoundation.Build.Server.Logger.dll";"Verbosity=Normal;"

00:00 Built
$/OMS/Branches/Product_2.0/Product/Product.sln
for default targets.
e:\localstore\ThisSpecificBuild\Product\Product.sln
(1586): Error parsing the nested
project section in solution file.

And this is the log from MSBuild:

Build started 7/6/2011 11:53:34 AM.
e:\localstore\ThisSpecificBuild\Product\Product.sln(1586):
Solution file error MSB5009: Error
parsing the nested project section in
solution file.

Build FAILED.

e:\localstore\ThisSpecificBuild\Product\Product.sln(1586):
Solution file error MSB5009: Error
parsing the nested project section in
solution file.

0 Warning(s)
1 Error(s)

Time Elapsed 00:00:00.19

The solution builds correctly from within Visual Studio.