Program type already present: android.support.v7.util.AsyncListUtil$1

I recognize that there are several "Program type already present" questions out there already, but none seem to fully address (or help with) my situation:
I am getting "Program type already present: android.support.v7.util.AsyncListUtil$1" - I think this started when I update from exoplayer 2.7. to exoplayer 2.8

Program type already present: android.support.v7.util.AsyncListUtil$1
Messagekind=ERROR, text=Program type already present: android.support.v7.util.AsyncListUtil$1, sources=[Unknown source file], tool name=Optional.of(D8)


At one point, Android Studio stopped complaining about AsynListUtil but began saying the same thing about Annotations.AnyRef

build.gradle pasted below. Any help would be appreciated. I have resolved any dependency/library conflicts flagged by Android Studio, and have done "Tools > Clean Project", "Tools > Rebuild Project", and "File > Invalidate Caches / Restart"

apply plugin: 'com.android.application'

android
signingConfigs
release
keyAlias 'sotdaakey'
keyPassword 'sotdaamerc'
storeFile file('C:/Users/Doug/AndroidStudioProjects/SpeakerDayAA_fromscratch/local files/keystores/android.jks')
storePassword 'sotdmerc'


compileSdkVersion 27
defaultConfig
applicationId 'com.hintonworx.speakerdayaa'
minSdkVersion 21
targetSdkVersion 27
versionCode 8
versionName '1.6'
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
signingConfig signingConfigs.release

buildTypes
release
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
signingConfig signingConfigs.release


flavorDimensions "recovery"
productFlavors
aa
//applicationId 'com.hintonworx.speakerday.aa'
applicationId 'com.hintonworx.speakerdayaa'
// must use this because AA version was originally published this way
testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'

na
applicationId 'com.hintonworx.speakerday.na'
testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'




dependencies
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:27.1.1'
// make customtabs 27.1.1 explicit, because play-services-ads:15.0.1 uses an earlier version
implementation 'com.android.support:customtabs:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.google.android.exoplayer:exoplayer:2.8.4'
implementation 'com.google.android.exoplayer:extension-mediasession:2.8.4'
implementation 'com.google.android.exoplayer:extension-ima:2.8.4'
implementation 'com.android.support:recyclerview-v7:27.1.1'
implementation 'com.android.support:cardview-v7:27.1.1'
implementation 'com.android.support:support-v13:27.1.1'
implementation 'com.jakewharton.timber:timber:4.1.1'
implementation 'com.google.firebase:firebase-core:16.0.3'
implementation 'com.google.android.gms:play-services-ads:15.0.1'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'commons-io:commons-io:2.5'



UPDATE:

I began to think it may be Firebase related, as per: Android Studio- Program type already present: com.google.android.gms.internal.measurement.zzwp

So removed the Firebase dependency and references in my code, but still get:

Program type already present: android.support.annotation.AnyRes
Messagekind=ERROR, text=Program type already present: android.support.annotation.AnyRes, sources=[Unknown source file], tool name=Optional.of(D8)


1 Answer
1

Solved. In my case, I found android-support-v4-23.1.1 and android-support-v7-recyclerview-23.1.1 in the /libs folder. They hadn't been causing me problems before updating exoplayer and Firebase. Removing those allowed me to compile and deploy again without errors. Not exactly sure how they had gotten there in the first place, but I think they were left from the library package install of an ad mediation network.

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