Not that you may have the same issue I did, but make sure that you don't have a "PlugIns" folder created which is housing an older version of the Entity Framework DLL.
I found that the Plugins folder assemblies are preferred even over those which are added directly as references to your query or added with NuGet.
Thank you! I finally found I will have to call "System.Data.Entity.DbFunctions" instead of "DbFunctions", though LinqPad gives me a different error message as "This function can only be invoked from LINQ to Entities", which I found a workaround by Google search().
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I found that the Plugins folder assemblies are preferred even over those which are added directly as references to your query or added with NuGet.
I finally found I will have to call "System.Data.Entity.DbFunctions" instead of "DbFunctions", though LinqPad gives me a different error message as "This function can only be invoked from LINQ to Entities", which I found a workaround by Google search().