Launch to Nexus 9

I get this error "Program.Main: ERROR: Exception in UnrealBuildTool: ERROR: Unknown NDK architecture ‘arm64-v8a’
In Project settings>Android Build section Support armv7(akaarmeabi-v7a) should be arm64-v8a. I am using tadp-4.0r1-windows. With lollypop api 21. The 64 bit is there, but 4.7.2 is not finding it. Does anyone know how to fix this? Thanx.