¿Cómo soluciono este error que recibo cuando abro mi aplicación hecha en Android Studio?

Hice una aplicación en Android Studio y funcionó para mí. Intenté exportar el apk para probarlo y funcionó. Hasta ahora tan bueno.

Luego, cuando lo subo a PlayStore, lo instalo y cuando intento abrirlo no puedo y me olvido de un error que incluyo en una captura.

La parte del código de la aplicación que creo que da un error es la siguiente:

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:customtabs:28.0.0'
implementation 'com.android.support:support-media-compat:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'

implementation 'com.android.support:design:28.0.0'
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 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.facebook.fresco:fresco:1.11.0'
implementation 'com.facebook.fresco:webpsupport:1.11.0'
implementation 'com.facebook.fresco:animated-webp:1.11.0'

implementation 'com.google.android.gms:play-services-ads:17.1.2'

}
Este es el código build.gradle:

apply plugin: 'com.android.application'

android {
//the compression of webp file during build causes problem with FileDescriptor in ContentProvider.
aaptOptions {
noCompress "webp"
}
compileSdkVersion 28
defaultConfig {
applicationId "com.shstickers.shstickers"
minSdkVersion 16
targetSdkVersion 28
versionCode 17
versionName "1.27"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
def contentProviderAuthority = applicationId + ".stickercontentprovider"
// Creates a placeholder property to use in the manifest.
manifestPlaceholders =
[contentProviderAuthority: contentProviderAuthority]
// Adds a new field for the authority to the BuildConfig class.
buildConfigField("String",
"CONTENT_PROVIDER_AUTHORITY",
"\"${contentProviderAuthority}\"")
}
buildTypes {
debug {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}

task checkDebug {
doLast {
println("checkDebug")
if (android.defaultConfig.applicationId.startsWith("com.whatsapp")) {
throw new GradleException("applicationId in defaultConfig cannot start with com.whatsapp, please change your applicationId in app/build.gradle");
}
checkApplicationIdInDebug()
}
}

private void checkApplicationIdInDebug() {
Properties properties = new Properties()
properties.load(project.rootProject.file('local.properties').newDataInputStream())
def ignoreApplicationIdCheck = properties.getProperty('ignoreApplicationIdCheck')
if (ignoreApplicationIdCheck == null) {
if (android.defaultConfig.applicationId.equals("com.example.samplestickerapp")) {
throw new GradleException("Your applicationId is currently com.example.samplestickerapp, please change your applicationId to a different string in app/build.gradle in line 16");
}
} else {
println("application id check ignored")
}
}

task checkRelease {
doLast {
println("checkRelease")
if (android.defaultConfig.applicationId.startsWith("com.example")) {
throw new GradleException("applicationId in defaultConfig cannot start with com.example, please change your applicationId in app/build.gradle");
}
}
}

tasks.whenTaskAdded { task ->
println(task.name)
if (task.name.contains("assembleDebug")) {
task.dependsOn checkDebug
}
if (task.name.contains("assembleRelease")) {
task.dependsOn checkRelease
}
}

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:customtabs:28.0.0'
implementation 'com.android.support:support-media-compat:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'


implementation 'com.android.support:design:28.0.0'
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 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation 'com.facebook.fresco:fresco:1.11.0'
implementation 'com.facebook.fresco:webpsupport:1.11.0'
implementation 'com.facebook.fresco:animated-webp:1.11.0'

implementation 'com.google.android.gms:play-services-ads:17.1.2' 

}
¿Alguna de idea de cómo arreglarlo? El error que aparece al abrir la aplicación en su dispositivo móvil después de instalarla se adjunta como una captura.