Файл проекта содержит ToolsVersion="<var>X</var>", не поддерживаемую данной версией MSBuild. Считается, что проект имеет ToolsVersion="4.0".

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Project file contains ToolsVersion="<var>X</var>", which is not supported by this version of MSBuild. Treating the project as if it had ToolsVersion="4.0".

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