Load PAK error

I have created a new map and packaged it in pak

Load this pak, the code and log are as follows

void AMyPakLoader::TestLoadPak(FString InPakFullPath) {
	FPlatformFileManager::Get().SetPlatformFile(*PakPlatform.Get());

	FString PakFileFullPath = InPakFullPath;
	FPakFile* TmpPak = new FPakFile(PakPlatform.Get() ,*PakFileFullPath, false);

	if (!TmpPak->IsValid()) { 
		UE_LOG(LogTemp, Error, TEXT("Pak error!Pak addres:%s"), *InPakFullPath);
		return;
	}


	FString PakMountPoint = TmpPak->GetMountPoint();
	int32 Pos = PakMountPoint.Find("Content/");
	FString NewMountPoint = PakMountPoint.RightChop(Pos);
	NewMountPoint = FPaths::ProjectDir() + NewMountPoint;

	TmpPak->SetMountPoint(*NewMountPoint);

	UE_LOG(LogTemp, Warning, TEXT("PakMountPoint:  %s    NewMountPoint:  %s"),*PakMountPoint,*NewMountPoint);

	if (PakPlatform->Mount(*PakFileFullPath, 1, *NewMountPoint))
	{
		TArray<FString> FoundFilenames;
		//TmpPak->GetPrunedFilenames(FoundFilenames);
		TmpPak->FindPrunedFilesAtPath(FoundFilenames, *NewMountPoint, true, false, true);

		if (FoundFilenames.Num() > 0)
		{
			for (FString& Filename : FoundFilenames)
			{
				if (Filename.EndsWith(TEXT(".umap")))
				{
					FString NewFileName = Filename;
					NewFileName.RemoveFromEnd(TEXT(".umap"));
					int32 Pos1 = NewFileName.Find("/Content/");
					NewFileName = NewFileName.RightChop(Pos1 + 8);
					NewFileName = "/Game" + NewFileName;

					UE_LOG(LogTemp, Warning, TEXT("load map  %s"),*NewFileName);
					UObject* LoadedObj = StaticLoadObject(UObject::StaticClass(), NULL, *NewFileName);

					if (LoadedObj) {
						UE_LOG(LogTemp, Warning, TEXT("map ok"));
					}
					else
					{
						UE_LOG(LogTemp, Error, TEXT("map error"));
					}

				}
			}
		}
	}

	FPlatformFileManager::Get().SetPlatformFile(*OldPlatform);

}

How to load the tt map