Android Gradle sync errors usually stem from outdated Kotlin versions or incompatible JVM versions. iOS CocoaPods errors are often fixed by deleting Podfile.lock.
If your Flutter app refuses to build right before a submission, these underlying environment caching issues are usually to blame.
Quick Fix Summary
- For Android: Update ext.kotlin_version in android/build.gradle.
- For iOS: Delete Podfile.lock and run pod repo update.
- For general issues: Run flutter clean and flutter pub get.
Root Causes
Outdated Kotlin Version
Your android/build.gradle file is using a Kotlin version older than 1.9.0, which clashes with modern Flutter plugins.
Corrupted CocoaPods Cache
iOS builds often fail because native dependencies are cached improperly. Deleting the lockfile forces a clean resolution.
Step-by-Step Fix Guide
Fixing Android Gradle Sync
Open your android/build.gradle file and bump the Kotlin version.
buildscript {
ext.kotlin_version = '1.9.0'
// ...
}Fixing iOS CocoaPods Mismatch
If iOS builds fail with missing pod dependencies, run this in your terminal to nuke the cache.
cd ios
rm -rf Pods
rm Podfile.lock
pod install --repo-update
cd ..
flutter clean
flutter runFlutter app refusing to run?
I can resolve your Gradle, CocoaPods, and UI overflow errors so you can submit a working APK.
Get Flutter HelpRelated Errors
A RenderFlex overflowed
Wrap overflowing components in Expanded or SingleChildScrollView widgets.
Prevention Strategy
- Always run flutter clean after upgrading a package in pubspec.yaml.
- Ensure your JAVA_HOME environment variable points to a modern Java version (17+).