Elementet <compilation> i Web.config-filen har ikke en attribut af typen 'targetFramework'. ASP.NET antager derfor, at webprogrammet har .NET Framework version 3.5 eller tidligere som destination, men ASP.NET kunne ikke finde de filer, som installeres med .NET Framework version 3.5, som det skal kompilere. Hvis du kompilerer dette webprogram til version 3.5 eller tidligere af .NET Framework, skal du sørge for, at version 3.5 af .NET Framework er installeret. Hvis du kompilerer dette webprogram til version 4 eller nyere af .NET Framework, skal du føje attributten 'targetFramework' til elementet <compilation> i Web.config-filen (f.eks. '<compilation targetframework="4.0">').</compilation></compilation></compilation>

The <compilation> element of the Web.config file does not have a 'targetFramework' attribute. Therefore ASP.NET assumes that the Web application targets the .NET Framework version 3.5 or earlier, but ASP.NET could not find files that are installed with the .NET Framework version 3.5 that it needs to compile. If you are compiling this Web application for version 3.5 or earlier of the .NET Framework, make sure that version 3.5 of the .NET Framework is installed. If you are compiling this Web application for version 4 or later of the .NET Framework, add the 'targetFramework' attribute to the <compilation> element of the Web.config file (for example, '<compilation targetframework="4.0">').</compilation></compilation></compilation>

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