Better yet (IMHO) download NDK r14b separately in the first place, appoint UE to it (in Project Settings->Platforms->Android SDK) and downgrade your SDK below 25.2.X (you probably have 26.X.X) to avoid further problems.
Better yet (IMHO) download NDK r14b separately in the first place, appoint UE to it (in Project Settings->Platforms->Android SDK) and downgrade your SDK below 25.2.X (you probably have 26.X.X) to avoid further problems.