During development, Flutter app on iOS occasionally won't launch

[lukepighetti]

I just added assets to my project and now the app won't launch on iOS. I haven't tested on Android. If I remove the assets from pubspec.yaml it will launch.

I added a 7kb png file like this (green).

flutter: 
  uses-material-design: true 
  assets:
    - assets/send.png

Error message:

Launching lib/main.dart on Luke's iPhone in debug mode...
Automatically signing iOS for device deployment using specified development team in Xcode project: TA8U33SGB8
Xcode build done.                                            8.5s
Configuring the default Firebase app...
6.3.0 - [Firebase/Core][I-COR000004] App with name __FIRAPP_DEFAULT does not exist.
6.3.0 - [Firebase/Analytics][I-ACS023007] Analytics v.60002000 started
6.3.0 - [Firebase/Analytics][I-ACS023008] To enable debug logging set the following application argument: -FIRAnalyticsDebugEnabled (see http://goo.gl/RfcP7r)
Configured the default Firebase app __FIRAPP_DEFAULT.
Could not update files on device: OS Error: Connection reset by peer, errno = 54
Exited (sigterm)

Deps

dependencies:
  flutter:
    sdk: flutter

  crypto: ^2.0.6
  cupertino_icons: ^0.1.2
  firebase_auth: ^0.11.1+7
  firebase_database: ^3.0.3
  hydrated: ^1.2.3
  intl: ^0.15.8
  provider: ^3.0.0+1
  rxdart: ^0.22.0
  timeago: ^2.0.16

Doctor

[✓] Flutter (Channel dev, v1.7.8, on Mac OS X 10.14.5 18F132, locale en-US)
    • Flutter version 1.7.8 at /Users/lukepighetti/flutter
    • Framework revision d51fd86cdb (2 days ago), 2019-06-21 22:31:55 -0400
    • Engine revision d004bcd4d6
    • Dart version 2.4.0

 
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at /Users/lukepighetti/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • ANDROID_HOME = /Users/lukepighetti/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 10.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 10.2.1, Build version 10E1001
    • CocoaPods version 1.7.2

[✓] iOS tools - develop for iOS devices
    • ios-deploy 1.9.4

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 3.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 26.0.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[✓] VS Code (version 1.35.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.1.0

[✓] Connected device (3 available)
    • Luke's iPhone • 0bc0c4864d8e08aac4456893cded68bf0b6767d5 • ios            • iOS 12.3.2
    • macOS         • macOS                                    • darwin-x64     • Mac OS X 10.14.5 18F132
    • web           • web                                      • web-javascript • Google Chrome 75.0.3770.100 


• No issues found!

[lukepighetti]

Alright, I did a computer restart and it worked. But then after I did a hot restart it quit working again.

[jonahwilliams]

Is it the action of adding this asset and hot reloading/restarting, or only the presence of it? Does this happen with other assets or in a fresh flutter create project?

[coastalgit]

I am experiencing the exact same error when attempting a launch from VSCode to a device (but works OK with sim), although with no asset adaption involved. The error only started occurring when I upgraded the device to iOS 12.3.1 When running the same code to the device directly from Xcode it works OK.

Launching lib/main.dart on BF iPhone 6 in debug mode...
Automatically signing iOS for device deployment using specified development team in Xcode project: 59J6XF5LU4
Xcode build done.                                           12.4s
Configuring the default Firebase app...
6.3.0 - [Firebase/Core][I-COR000004] App with name __FIRAPP_DEFAULT does not exist.
Configured the default Firebase app __FIRAPP_DEFAULT.
6.3.0 - [Firebase/Messaging][I-FCM001000] FIRMessaging Remote Notifications proxy enabled, will swizzle remote notification receiver handlers. If you'd prefer to manually integrate Firebase Messaging, add "FirebaseAppDelegateProxyEnabled" to your Info.plist, and set it to NO. Follow the instructions at:
https://firebase.google.com/docs/cloud-messaging/ios/client#method_swizzling_in_firebase_messaging
to ensure proper integration.
6.3.0 - [Firebase/Analytics][I-ACS023007] Analytics v.60002000 started
6.3.0 - [Firebase/Analytics][I-ACS023008] To enable debug logging set the following application argument: -FIRAnalyticsDebugEnabled (see http://goo.gl/RfcP7r)
Could not update files on device: OS Error: Connection reset by peer, errno = 54
Exited (sigterm)

Reboot of device and MacBook has not resolved either.

[lukepighetti]

I don't have anything particularly helpful to add to this but I've been experiencing this on macOS since I started using Flutter in mid 2018. I see it come up in your average project that has a few screens and a few deps and possibly some assets. I haven't been able to figure out what causes it. The fact that you can spam flutter run and it works 30% of the time makes it really hard to track down since it's an intermittent problem.

[lukepighetti]

@jonahwilliams I'm sorry I don't have any conclusive answer to that question.

[kangwang1988]

@lukepighetti
Can you do some experiment to check whether it will work fine if you change to another picture, for example, a smaller png or jpg? It seems related to the send.png.

[lukepighetti]

Quick update. I just had a new project that was working fine until I added nine ~120kb *.png files to assets/images, and added this line to pubspec.yaml. Before this I had multiple Font assets that were working perfectly in fonts/

flutter:
  uses-material-design: false
  assets:
    - assets/images/

It Exited (sigterm) with no error three times, launched once. Then I had to restart because I had typed in the asset path incorrectly within my Flutter app. It then Exited (sigterm) once with no error. Then it gave a 54 error four times stating that it couldn't upload files to device (lost the exact error message, sorry). And now it says "Could not install XYZ. Try launching Xcode and selecting "Product > Run"".

Open XCode, click Play. Build Failed. Code signing error, need a team. (This didn't come up before?) Selected my team, click Play. Builds perfectly and quickly. Quit XCode, go back to VSC, hit debug. Starts no problem.

Kill from VSC and debug again, Exited (Sigterm) with no error.
Run from VSC again, Exited (Sigterm) with no error.
Run from VSC again, Exited (Sigterm) with error Could not update files on device: OS Error: Connection reset by peer, errno = 54.
Run from VSC again, starts.

Frustrating!