How to Spawn ACTORS Using a GAMEMODE in Unreal Engine 5 C++

I am getting this error while playing the level:-
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:C:\Program Files\Epic Games\UE_5.3\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 771] Array index out of bounds: 0 from an array of size 0