Module 'x' not found (iOS build) Flutter / Dart Origin: On your device OSI layer 7 · Application Last updated 4 Nov 2026

Xcode: Module 'firebase_core' not found — flutter build ios fails after adding a plugin

The iOS project cannot find a CocoaPods module, usually because Pods are missing, outdated, or the workspace was not used.

Exact message you may see Module 'firebase_core' not foundModule not found Flutter iOS buildXcode build failed Module not foundfatal error: module 'Flutter' not foundCould not build the application for the simulator Module not found
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Seen on: Flutter iOS

Meaning

After adding plugins run pod install in ios/, open Runner.xcworkspace (not .xcodeproj), and clean stale artifacts. On Apple Silicon, mismatched architectures or an old Podfile.lock can also trigger this.

Common causes

  • pod install not run after pub get
  • Opening Runner.xcodeproj instead of the workspace
  • Stale Pods/Podfile.lock
  • Deployment target lower than the plugin requires
  • Architecture mismatch on Apple Silicon

⚡ Quick fix

  1. flutter clean && flutter pub get && cd ios && pod install --repo-update
  2. Open Runner.xcworkspace
  3. Raise the iOS deployment target in the Podfile

Detailed fix by platform

Flutter

  1. cd ios && rm -rf Pods Podfile.lock && pod install --repo-update

How to diagnose

  1. Workspace — Using .xcworkspace?
  2. Pods — Installed?
  3. Target — iOS version high enough?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

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