Errors after conversion to 4.9

It is not a big deal, and been confirmed within the 4.9 release notes. Basically when you see this error it means that you need to check your [ProjectDir]\Config\DefaultEngine.ini file for a large block of ActiveClassRedirects, K2FieldRedirects, etc… and remove any that are not game specific.

Fyi, here is the proper section of the 4.9 notes:

-m