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I have ASP.NET web api project created on .NET v 4.5 I later i was decided to change framework to 4.0 After changing i got an error. VS can not regognize types and namespaces althougt all required librariesare referenced. It does not happen to newly creted test API project.

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Try to check that the dlls you are referencing are for version 4.0 and not 4.5, could be you are still referencing 4.5 libraries which won't work with .net 4.

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thanks. i created the project from scratch and simply copied all necessary files

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