Can't build UE4.23 for Android9(API28)

I firstly installed CodeWorksforAndroid-1R7u1 , but it doesn’t contain “android-28” files in platform of ndk and sdk file.

**ERROR: The NDK API requested ‘android-28’ not installed in C:/NVPACK/android-ndk-r14b/platforms. **

299440-コメント-2020-04-11-123814.png





Therefore, I installed CodeWorksforAndroid-1R8 which contains “android-28” files,
and checked what there are “android-28” files in the ndk-r18b files and sdk file.
However, I couldn’t build a project.

ERROR: Android toolchain NDK r18c not supported; please use NDK r14b to NDK r18b


I tried putting "android-28" files into the ndk-r14b and sdk files when I installed CodeWorksforAndroid-1R7u1, but an error has occuerd. (Sorry, I forgot copying the log.)
Please tell me what should I do from now on?