Property "MSBuildExtensionsPath32" is not defined?

I'm getting a code issue under the heading of "Potential Code Quality Issues" and it's saying there is a problem in the .csproj file. The problem is being reported as Property "MSBuildExtensionsPath32" is not defined. Is this a legit issue? I'm not having any problems with my project and I've seen this "issue" on multiple projects?

For reference here's the details about the version I'm running:

JetBrains ReSharper 5.1 Full Edition
Build 5.1.3000.12 on 2011-01-28T04:05:56

Licensed to: ***************************
Plugins: none.
Visual Studio 10.0.30319.1.

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