How to use ConstructorHelpers::FObjectFinder and SpawnActor to spawn a blueprint

try:

AActor* bpActor=(AActor*)Wall_X->GeneratedClass->GetDefaultObject();
world->SpawnActor<AActor>(bpActor,spawnLocation,spawnRotation)

If that doesn’t work you could try:

world->SpawnActor<AActor>(Wall_X->GeneratedClass,spawnLocation,spawnRotation);