Android ProGuard Building a signed apk fails with gradle plugin 3.0.1 (4.1?)

ProGuard keeps giving errors and not letting me build a signed APK: (full console output)

Red lines:

Warning: com.package.name.MainActivity$20$1: can't find referenced field 'android.widget.RadioGroup val$dialogReport' in program class com.package.name.MainActivity$20
Warning: com.package.name.MainActivity$20$1: can't find referenced field 'android.support.v7.app.AlertDialog val$dialog' in program class com.package.name.MainActivity$20
Warning: com.package.name.MainActivity$20$1: can't find enclosing method 'void onShow(android.content.DialogInterface)' in program class com.package.name.MainActivity$20
Warning: com.package.name.MainActivity$8$1: can't find referenced method 'int access$1100()' in program class com.package.name.MainActivity
Warning: com.package.name.MainActivity$8$1: can't find referenced method 'android.support.v4.util.ArrayMap access$1200()' in program class com.package.name.MainActivity
Warning: com.package.name.MainActivity$8$1: can't find referenced class com.package.name.MainActivity$DeleteSpotTask
Warning: com.package.name.MainActivity$8$1: can't find referenced class com.package.name.MainActivity$DeleteSpotTask
Warning: com.package.name.MainActivity$8$1: can't find referenced class com.package.name.MainActivity$DeleteSpotTask
Warning: com.package.name.MainActivity$8$1: can't find referenced method 'android.support.v4.util.ArrayMap access$1500()' in program class com.package.name.MainActivity
Warning: com.package.name.MainActivity$8$1: can't find referenced method 'void access$1600(com.package.name.MainActivity)' in program class com.package.name.MainActivity

My build.gradle

And my build.gradle:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath 'com.google.gms:google-services:3.1.0'
    }
}

allprojects {
    repositories {
        jcenter()
        google()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

This started happening after updating com.android.tools.build:gradle:3.0.0 to com.android.tools.build:gradle:3.0.1.

Compiles without any errors when it is com.android.tools.build:gradle:3.0.0