DoesPackageExist FAILED: 'TestingAsset' is not a standard unreal filename or a long path name. Reason: Path should start with a '/'

TestingAsset was created by code:

UPackage *Package = CreatePackage(nullptr, *PackagePath);
USoundWave* TestAsset = NewObject<USoundWave>(Package, USoundWave::StaticClass(), *FString("TestingAsset"), EObjectFlags::RF_Public | EObjectFlags::RF_Standalone);

FAssetRegistryModule::AssetCreated(TestAsset);
TestAsset->MarkPackageDirty();

How to delete this asset?

[Solved]
Need to delete this uasset from UE4 folder:
Epic Games\UE_4.17\Engine\Binaries\Win64