Error:Program type already present: android.arch.lifecycle.LiveData

Question

When I press the run button in Android Studio, my app compiles but shows this error (redacted):

Error:Program type already present: android.arch.lifecycle.LiveData 

(Full log)

I've tried deleting the .gradle folder, then going to Build > Clean Project and Build > Rebuild Project. However, it doesn't work. I've also tried deleting the source code, then cloning again from git and importing the folder to Android Studio. However, it still produces that error.

Here's my app's app/build.gradle:

apply plugin: 'com.android.application'  android {     compileSdkVersion 27     buildToolsVersion '27.0.3'     defaultConfig {         applicationId "com.edricchan.studybuddy"         minSdkVersion 24         targetSdkVersion 27         versionCode 8         versionName "1.0.0-rc.503"         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"         resConfigs "en"         multiDexEnabled true     }     buildTypes {         release {             minifyEnabled false             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'         }     }     dataBinding {         enabled = true     } }  dependencies {     implementation 'com.android.support:support-v4:27.1.0'     implementation 'com.android.support:support-annotations:27.1.0'     implementation fileTree(dir: 'libs', include: ['*.jar'])     androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {         exclude group: 'com.android.support', module: 'support-annotations'     })     implementation 'com.android.support:appcompat-v7:27.1.0'     implementation 'com.android.support.constraint:constraint-layout:1.0.2'     implementation 'com.android.support:design:27.1.0'     implementation 'com.android.support:cardview-v7:27.1.0'     testImplementation 'junit:junit:4.12'     // Firebase stuff     implementation 'com.google.firebase:firebase-storage:11.8.0'     implementation 'com.google.firebase:firebase-firestore:11.8.0'     implementation 'com.google.firebase:firebase-auth:11.8.0'     implementation 'com.google.firebase:firebase-messaging:11.8.0'     implementation 'com.google.android.gms:play-services-auth:11.8.0'     implementation 'com.firebaseui:firebase-ui-auth:3.1.0'     implementation 'com.firebaseui:firebase-ui-firestore:3.1.0'     implementation 'com.firebaseui:firebase-ui-storage:3.1.0'     // Provide a way to update the app     implementation 'com.github.javiersantos:AppUpdater:2.6.4'     // Chrome Custom Tabs     implementation 'com.android.support:customtabs:27.1.0'     // The app's intro screen     implementation 'com.heinrichreimersoftware:material-intro:1.6.2'     // Use for new Material Text field boxes recently introduced     implementation 'com.github.HITGIF:TextFieldBoxes:1.3.7'     // Report an issue to Github without having to open a new tab and so on...     implementation 'com.heinrichreimersoftware:android-issue-reporter:1.3.1' } apply plugin: 'com.google.gms.google-services' 

Answer 1

Apparently, this is intended behavior:

com.firebaseui:firebase-ui-firestore:3.1.0 depends on android.arch.lifecycle:extensions:1.0.0-beta1. Switching to version 3.2.2 fixes the issue by using the Lifecycle 1.1 libraries that Support Library 27.1.0 are built upon. - Issue Tracker

For me, removing the firebase-ui dependencies solved the issue since I wasn't even using the library in the first place.