Flutter/Dart error: Execution failed for task ':app:checkDebugAarMetadata' - flutter

Question

I recently went back to my old flutter project and updated a bunch of things because I was getting errors. Now I'm getting the error below. I have been on it for at least 3 days and have tried a bunch of different things, but I still can't seem to find the solution. Any help is much appreciated. I have also included the build.gradle files below:
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:checkDebugAarMetadata'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
> Could not resolve com.google.android.gms:play-services-location:16.+.
Required by:
project :app > project :location
> Failed to list versions for com.google.android.gms:play-services-location.
> Unable to load Maven meta-data from https://google.bintray.com/exoplayer/com/google/android/gms/play-services-location/maven-metadata.xml.
> Could not get resource 'https://google.bintray.com/exoplayer/com/google/android/gms/play-services-location/maven-metadata.xml'.
> Could not GET 'https://google.bintray.com/exoplayer/com/google/android/gms/play-services-location/maven-metadata.xml'. Received status code 502 from server: Bad Gateway
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 18s
[!] Gradle threw an error while downloading artifacts from the network. Retrying to download...
Exception: Gradle task assembleDebug failed with exit code 1
Below is my android\build.gradle:
buildscript {
ext.kotlin_version = '1.4.20'
repositories {
google()
//jcenter()
mavenCentral()
maven { url "https://maven.google.com/"}
}
dependencies {
classpath 'com.google.gms:google-services:4.3.10'
classpath 'com.android.tools.build:gradle:4.2.2'
classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:' + String.valueOf(kotlin_version)
}
}
allprojects {
repositories {
google()
//jcenter()
mavenCentral()
maven { url "https://maven.google.com/"}
}
}
rootProject.buildDir = '../build'
subprojects {
project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
project.evaluationDependsOn(':app')
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Here's my app\build.gradle:
def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
}
}
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
throw new FileNotFoundException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}
def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
}
def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
flutterVersionName = '1.0'
}
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
android {
compileSdkVersion 30
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
lintOptions {
disable 'InvalidPackage'
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "[id here]"
minSdkVersion 21
targetSdkVersion 30
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
multiDexEnabled true
}
buildTypes {
release {
// TODO: Add your own signing config for the release build.
// Signing with the debug keys for now, so `flutter run --release` works.
signingConfig signingConfigs.debug
}
}
}
flutter {
source '../..'
}
dependencies {
implementation 'com.google.firebase:firebase-analytics:20.0.1'
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.4.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
implementation 'com.google.android.gms:play-services-ads:20.5.0'
}

Answer 1

There seems to be a reoccurring issue with the bintray repository, To fix the issue, I followed this really helpful solution: https://stackoverflow.com/a/70319873/13843688
Everything is now working as expected.