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Configuration Error: [...] targetFramework="4.5" [...] on Windows 7

Question / Problem

Configuration Error: [...] targetFramework="4.5" [...]  on Windows 7

Answer / Solution

Possible Reason: ASP.NET 4.0 is installed, but not registered.

  1. Open the windows command line.
  2. Go to 'C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\' and execute the following command: aspnet_regiis.exe –iru
  3. Execute the setup of SpaceObServer Web Access again and use the repair function.