Flutter: Failed to find assets path for "flutter_assets" error

Question

I am trying to embed a Flutter module into iOS app. But when i tap the button that will show the FlutterViewController, a blank screen shows up and this is printed on the console:

Failed to find assets path for "flutter_assets"
[VERBOSE-2:engine.cc(111)] Engine run configuration was invalid.
[VERBOSE-2:FlutterViewController.mm(462)] Could not launch engine with configuration.
flutter: Observatory listening on http://127.0.0.1:54632/

• I followed this tutorial https://github.com/flutter/flutter/wiki/Add-Flutter-to-existing-apps

• I added a FLUTTER_ROOT to my build settings

• I tried running the app with a FlutterAppDelegate and also a FlutterViewController

• My flutter doctor says nothing is wrong.

Answer 1

I solved it by changing to master channel and it solved.

• To change channel use the cli flutter channel master
• After that I deleted the ".ios" folder inside the flutter project and run a flutter build --ios to force Flutter to re-generate the .ios folder.
• Then I did a pod install in my native iOS app.

Answer 2

There are several ways this could happen that I've seen:

1. You're missing your flutter_assets folder completely
2. You're trying to use AOT compiled Flutter app (e.g. profile or release mode) with a debug engine build.
3. You're trying to use JIT compiled Flutter app (debug) with a profile/release engine.

It sounds like you're missing your flutter_assets. Please follow the steps on the Add2App wiki.

I'm actively working on making this process easier - unfortunately, there are a lot of manual steps right now that are easy to get wrong.