EPiServer Visitor Groups For Developers - 1 of 4 Creating a simple criterion

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I got the message "EPiServer.Personalization.Vis­itorGroups.VisitorGroupCriteri­on" is not an attribute class, and was also prompted to reference a version of the System.ComponentModel.Composit­ion library despite having already referenced it. This was because I was building against a .NET version other than 3.5. When I changed the AlloyTech project target framework back to 3.5, the project compiled fine. Thanks for the useful videos.