Would still like to find a solution to this problem but I’ve also found a good alternative solution for anyone wanting to do a targeting system but can’t get GAS working. Using the Targeting System plugin (free beta plugin comes with the engine): https://www.youtube.com/watch?v=1OPQt8V3Eis
A crash there is in the AimWithPlayerController function used for the trace and signals it requires a valid PlayerController be assigned to the owning actor set up in your CurrentActorInfo for the actor calling that GA_Target.
I think it’s a great in addition to GAS. I think GAS is best used for networking attributes and applying abilities/gameplayeffects to those attributes based on tags, and gameplaycues are awesome too, but I avoid shoe-horning a lot of functionality through the system. Some of the example stuff is not the best implementation TBH.