CacheRootKey property was recently removed from the BasePart, but is still present in the samples - you can put your own value, it is just a simple string constant that uniqely identifies your part in the cache store. For example, BlogList uses CacheKeys.Blog.BlogList, which simply holds a string value "MxBlogList". You can put "MyPopularGroups" or something like that.
As for other errors, these are easy to fix - just delete the failing references from the project and add them again from the /bin folder of MonoX - from your screenshots, I would say that you need to do it for MonoX.dll, MonoSoftware.MonoX.DAL.dll and SD.LLBLGen.Pro.ORMSupportClasses.NET35.dll.
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