Android api 28 not package

Hi

When i upload my app on the playstore, i have an error because now the playstore want the api 28 target to upload on it.

So i install the sdk 28 and when i package i have this error :

android toolchain NDK r18c not supported

Maybe i setup worst :

https://i.ibb.co/vH6C9HB/Android-1.png

https://i.ibb.co/tqkGLLL/Android-2.png

Thanks for help