External VS2013 build error “error MSB4019: The imported project was not found”

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I had the same issue and find an easier solution

It is due to Vs2012 adding the following to the csproj file:

<PropertyGroup>
  <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
  <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
</PropertyGroup>

You can safely remove that part and your solution will build.

As Sielu pointed out you have to ensure that the .proj file begin
with <Project ToolsVersion="12" otherwise the next time you open the
project with visual studio 2010, it will add the removed node again.

Otherwise, if you need to use webdeploy or you use a build server, the above solution will not work but you can specify the VisualStudioVersion property in your build script:

msbuild myproject.csproj /p:VisualStudioVersion=12.0

or edit your build definition:

edit build definition to specify the <code>VisualStudioVersion</code> property

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