在离子3-“离子cordova运行android”和“离子cordova构建android”中，出现了错误。

Question

我正在使用Ionic 3，当我试图执行“离子型cordova运行android”时，它给出了以下错误，请帮助我解决这个问题-

[16:13:25]  dev server running: http://localhost:8101/

[ERROR] app-scripts serve unexpectedly failed.settings: undefinedcontext: [object Object]


    C:\DevArea\IonicApp\MyApp>cordova run android
    ANDROID_HOME=C:\Users\kavita.verma1\AppData\Local\Android\sdk
    JAVA_HOME=C:\Program Files\Java\jdk1.8.0_131
    Subproject Path: CordovaLib
    Exception in thread "main" java.lang.NullPointerException
            at org.gradle.wrapper.PathAssembler.getDistName(PathAssembler.java:84)
            at org.gradle.wrapper.PathAssembler.getDistribution(PathAssembler.java:40)
            at org.gradle.wrapper.Install.createDist(Install.java:44)
            at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:107)
            at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
    Error: cmd: Command failed with exit code 1 Error output:
    Exception in thread "main" java.lang.NullPointerException
            at org.gradle.wrapper.PathAssembler.getDistName(PathAssembler.java:84)
            at org.gradle.wrapper.PathAssembler.getDistribution(PathAssembler.java:40)
            at org.gradle.wrapper.Install.createDist(Install.java:44)
            at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:107)
            at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)

离子版本

    C:\DevArea\IonicApp\MyApp>ionic -v
    3.4.0

Answer 1

删除用户数据中的.gradle。

例：C:\Users\admin\.gradle

然后再试：

ionic cordova run android

Answer 2

尝试删除node_modules文件夹

然后跑

npm install

或者将Ionic重新安装到最新版本

Answer 3

检查您的平台

cordova platform ls

如果没有安装android，请使用下面命令，然后再试一次。

cordova platform add android@6.0.0