Can't use KismetSystemLibrary in blueprint despite already doing include.

Hi .

I made a class extending from UObject and extend it from blueprint.

However it seems that despite including KismetSystemLibrary.h

I am still unable to use functions like GetGameMode , Delay, Linetrace and all the useful blueprint function.
The weird part however is that , I am able to access my own blueprint function library.

Help would be appreciated.