Maybe it because of lacking EPiServer.Packaging. Please install and tell me the result.
Installing the EPiServer.Packaging nuget package is not the recommended solution. Please see my blog post for recommended solutions: https://world.episerver.com/blogs/Ben-McKernan/Dates/2018/1/issue-with-modules-not-being-found-in-cms-11/
After installing EPiServer Forms 4.8 i get this error: