Answer by Oskar for Error retrieving parent for item: No resource found that matches the given name after upgrading to AppCompat v23

Your compile SDK version must match the support library major version. This is the solution to your problem. You can check it easily in your Gradle Scripts in build.gradle file. Fx: if your compileSdkVersion is 23 your compile library must start at 23.

  compileSdkVersion 23
    buildToolsVersion "23.0.0"
    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 340
        versionName "3.4.0"
    }
dependencies {
    compile 'com.android.support:appcompat-v7:23.1.0'
    compile 'com.android.support:recyclerview-v7:23.0.1'
}

And always check that your Android Studoi has the supported API Level. You can check it in your Android SDK, like this: