Failed to load AppCompat ActionBar with unknown error?

Question

build.gradle file

    apply plugin: \'com.android.application\'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId \"io.d         


        

Answer 1

Set your target sdk version to 27 . Set your compile sdk version to 27 . And app compat version from 28.0.0-alpha3 to 27.1.1 .

If you still want to use sdk version 28

Just replace alpha3 to alpha1 without changing anything else