How to SpawnActor with differnet staticmesh?

Could you please explain more about “MotherObject” and its initialization. I’ve tried as below

StaticRootcomp = CreateDefaultSubobject(TEXT("Mesh0"));
    UObject* staticmesh = StaticRootcomp;

        FActorSpawnParameters MyParams;
	MyParams.Owner = staticmesh;

But, getting an ERROR as Cannot be assigned to an entity of type “AActor*”. As a beginner, I couldn’t understand properly. Please help me or any tutorials will be great.