How to solve sdk issue when compiling Unity?

Question

Android

After adding the UnityAds asset, when compiling the game, an error began to be thrown (screen1).

After studying its text, I realized that there was something with sdk and in player settings > other settings > minimum api level instead of 16 - 19 (also set 21 and higher). But after the start of knocking out other errors (skri2 + text):

1.CommandInvokationFailure: Gradle build failed. 
C:/Program Files/Java/jdk1.8.0_261\bin\java.exe -classpath "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.6.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':processReleaseResources'.
> Android resource linking failed
  Output:  C:\Users\username\Desktop\SuperMegaCaseSimulator\Temp\gradleOut\build\intermediates\incremental\mergeReleaseResources\merged.dir\values\values.xml:194: error: resource android:attr/fontStyle not found.
  C:\Users\username\Desktop\SuperMegaCaseSimulator\Temp\gradleOut\build\intermediates\incremental\mergeReleaseResources\merged.dir\values\values.xml:195: error: resource android:attr/font not found.
 .... ///ЗДЕСЬ НЕ ВСЯ ОШИБКА

2.UnityEditor.BuildPlayerWindow+BuildMethodException: 2 errors
  at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0020e] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:181 
  at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00065] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:88 
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

I don't even know how to start looking for something about this error. on it to solve to address on habr.

Answer 1

Probably a problem with the Android SDK.
You can download the 200+GB SDK in the Android Studio manager, or install the one that comes with the engine when you install it via the Unity Hub.