If this type of error comes while running WPF application then follow following steps.
1) Check which version of .net framework install in the GAC (gacutil.exe), if the version install in the gac is not 4.0 then re-install 4.0 into gac or remove installed version and install new version 4.0
Or do this
2) check in control panel which versions of .net framework are install in the machine, if machine have installed versions 2.0, 3.0, 3.5 then remove all and install only version 4.0.
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