Таже ошибка, что здесь:
https://stackoverflow.com/questions/62398553/compilation-failed-android-after-installation-of-react-native-keychain
Добавил:
buildToolsVersion = "29.0.3"
minSdkVersion = 16
compileSdkVersion = 29
targetSdkVersion = 29
, но все паломалось:
Could not resolve all files for configuration ':app:androidApis'.
Failed to transform android.jar to match attributes {artifactType=android-mockable-jar, org.gradle.libraryelements=jar, org.gradle.usage=java-runtime, returnDefaultValues=false}.
Execution failed for MockableJarTransform: /Users/playra/Library/Android/sdk/platforms/android-29/android.jar.
Cannot create mockable android.jar
/Users/playra/Library/Android/sdk/platforms/android-29/android.jar (No such file or directory)
29 веерсию SDK установил