Everything was working fine then suddenly I've got this error all over the place. Not sure what I did wrong or what to do about it:
Error 3 The type 'System.Web.Security.MembershipUser' exists in both 'C:\Windows\Microsoft.NET\Framework\v2.0.50727\System.Web.dll' and 'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\System.Web.ApplicationServices.dll'
Any help would be appreciated.
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