Flutter Could not prepare to run the isolate

问题

I started a flutter project using Android studio. The android emulator opened the project smoothly. When I opened the Ios emulator, the project worked smoothly. When I ran the android emulator again, project isn't runed . Thanks for your help.

Android Studio Features :

Android Studio 3.0
Build #AI-171.4408382, built on October 20, 2017
JRE: 1.8.0_152-release-915-b08 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Mac OS X 10.12.6

Flutter : v0.4.4 Beta

Console :

Launching lib/main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...
Resolving dependencies...
Running 'gradlew assembleDebug'...
Built build/app/outputs/apk/debug/app-debug.apk.
I/FlutterActivityDelegate( 2747): onResume setting current activity to this
E/flutter ( 2747): [ERROR:flutter/shell/common/engine.cc(147)] Could not prepare to run the isolate.
E/flutter ( 2747): [ERROR:flutter/shell/common/engine.cc(112)] Engine not prepare and launch isolate.
E/flutter ( 2747): [ERROR:flutter/shell/platform/android/android_shell_holder.cc(138)] Could not launch engine in configuration.
Syncing files to device Android SDK built for x86...
Application finished.

回答1:

I had the same error and it happened when I didn't write the main method. so do this

void main() => runApp(MyApp());

MyApp is my main class

回答2:

please check whether your Flutter Project containsmain.dart in lib folder, if not, create it.
check your code like this:

import 'package:flutter/material.dart';
import 'package:module_flutter/xxxApp.dart';

void main() => runApp( new xxxApp());

回答3:

Make sure you'r app is not running multiple instances. Try to stop them all first.

回答4:

I have the same error. I tried many ways and this is the right way.

You need to run

flutter build ios --debug (or --profile or --release)

before you launch the project in Xcode.

来源：https://stackoverflow.com/questions/50654820/flutter-could-not-prepare-to-run-the-isolate

标签

android

mobile

android-emulator

dart

Flutter