Unresolved External Symbol with UFactory Class

Development Programming & Scripting C++
2

This is a common error that occurs when you have forgotten to update your projects and plugins modules and build dependencies. Have you updated your Build.cs file to include any dependencies?

https://forums.unrealengine.com/development-discussion/c-gameplay-programming/40950-how-to-set-the-build-cs-file-for-use-slate

Hope this helps