我目前正在尝试使用Flutter在Windows上构建一个已签名的版本APK.我已经执行了flutter站点上的文档中概述的任务.当我运行build命令时,我得到的输出.它似乎是在firebase插件周围.有任何想法吗？

pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  firebase_auth: 0.4.0
  firebase_database: ^0.3.0

颤动的医生输出

    C:\Users\myuser\projects\myflutterapp>flutter doctor
    [?] Flutter (on Microsoft Windows [Version 10.0.16299.125], locale en-US, channel alpha)
        • Flutter at C:\Users\myuser\flutter
        • Framework revision 8f65fec5f5 (3 weeks ago), 2017-12-12 09:50:14 -0800
        • Engine revision edaecdc8b8
        • Tools Dart version 1.25.0-dev.11.0
        • Engine Dart version 2.0.0-edge.d8ae797298c3a6cf8dc9f4558707bd2672224d3e

    [?] Android toolchain - develop for Android devices (Android SDK 27.0.1)
        • Android SDK at C:\Users\myuser\AppData\Local\Android\Sdk
        • Android NDK at C:\Users\myuser\AppData\Local\Android\Sdk\ndk-bundle
        • Platform android-27, build-tools 27.0.1
        • ANDROID_HOME …