Include of non-modular header inside framework module 'firebase_storage.FLTTaskStateChannelStreamHandler'

Question

When debugging for iOS with Flutter, the following error occurs during build.

Lexical or Preprocessor Issue (Xcode): Include of non-modular header inside framework module 'firebase_storage.FLTTaskStateChannelStreamHandler': '/Users/User1/FlutterProjects/flutter_project/ios/Pods/Headers/Public/Firebase/Firebase.h' /Users/User1/.pub-cache/hosted/pub.dev/firebase_storage-11.7.7/ios/Classes/FLTTaskStateChannelStreamHandler.h:12:8

env

Xcode 16, iOS Simulator 17.5 and 18.0

Flutter 3.24.2 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 4cf269e36d (2 weeks ago) • 2024-09-03 14:30:00 -0700
Engine • revision a6bd3f1de1
Tools • Dart 3.5.2 • DevTools 2.37.2

Answer 1

This came from an answer already posted, but there was a part missing in the GitHub issue I didn't get at first.

To fix this you need to Open Xcode and set Allow non-modular Includes In Framework Modules to Yes.

Xcode setting to change

You can do this by:

• Opening up the ios folder of your app in Xcode
• Click on Runner > Then click on Build Settings
• Make sure All is selected in the filter bar
• Search for Allow to find the setting to toggle to Yes

This cleared up the issue and my app was able to be built and launch on the simulator.

Answer 2

Xcode 16

need to set Allow non-modular Includes In Framework Modules to Yes.

Apple are really trying to hide this option, but I found it -