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I upgraded my dev instance from Sitecore 8.1 Update 2, to Sitecore 8.2.

It indicated that my upgrade was successful. But now I get this error message when I try to access my site or after login to the admin:

Attempt by method 'Glass.Mapper.Sc.Utilities.get_IsPageEditor()' to access method 'Sitecore.Context+PageMode.get_IsPageEditor()' failed.

Looking in the bin folder it appears that the site currently has the DLLs for:

  • Glass.Mapper: 4.2.3.190
  • Glass.Mapper.Sc: 4.2.3.190
  • Glass.Mapper.Sc.Mvc: 4.2.3.190
  • Glass.Mapper.Sc.CastleWindsor.dll: 3.5.3.0

Are these correct? :-(

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  • Well Sitecore.Context.PageMode.IsPageEditor was deprecated, in favor of Sitecore.Context.PageMode.IsExperienceEditor. Without having looked too deeply, I would check if there is a later version of Glass.Mapper to upgrade to and/or if there is a Glass.Mapper.Sc.Utilities.IsExperienceEditor method or a method that calls the non-deprecated method Nov 15, 2016 at 16:55
  • I did a global search and don't see any references to IsPageEditor in my code. It seems to be failing on this line: @Html.Sitecore().Placeholder("header_content") Nov 15, 2016 at 18:00
  • @CoreySmith same error, but does not -appear- to be the same cause. I don't have a separate NuGet package installed for MVC as indicated as the cause for the issue for that error. Nov 15, 2016 at 18:05

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