Potential solution: "Create widget with a null class"

[TCP]

If you have this error after following the code precisely, make sure to check that your BP_KillEmAllGameMode is referencing “BP_ShooterPlayerController” for the player controller class
In my case this error was due to referencing the “ShooterPlayerController.cpp” instead of the blueprint.

This really illustrates the utility of prefixing.

Hopefully this wasn’t nonpolar’s problem, their solution was somewhat extreme in its scope.

[beegeedee]

This is good advice. It’s so easy to miss something like this.
Thanks for sharing.

[Bauti_peral]

thank you i wasnt able to find the solution you are a hero