arm74-v8a error

Trying to create a game for a Nexus 9 using Unreal(4.7.2). When I launch I get “Program.Main: ERROR: Exception in UnrealBuildTool: ERROR: Unknown NDK architecture ‘arm64-v8a’”. I have Tegra Tadp-4.0r1-windows installed. I see this error all over the net. No solution so far. No help from Unreal.