Build error ,Gradle -> Error:Execution failed for task ':app:preDexDebug'. > org.gradle.process.internal.ExecException:

Question

I use Android Studio.

Module App:

apply plugin: 'com.android.application'
android {
    compileSdkVersion 21
    buildToolsVersion '22.0.1'
    compileOptions {
        encoding "UTF-8"

    }
    defaultConfig {
        applicationId "com.my.app"
        minSdkVersion 10
        targetSdkVersion 22
        versionCode 1
        versionName '1'
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
    compile files('libs/volley.jar')
    compile 'com.google.android.gms:play-services:7.5.0'
}

Project com.my.app

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.2.3'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

But I get this error:

error : Error:Execution failed for task ':app:preDexDebug'.
org.gradle.process.internal.ExecException: A problem occurred starting process 'command 'C:\Program
Files\Java\jdk1.8.0_45\bin\java.exe''

With gradlew compileDebug --stacktrace :

* Exception is:
org.gradle.execution.TaskSelectionException: Task 'compileDebug' is ambiguous in
 root project 'BillionsOfPeople'. Candidates are: 'compileDebugAidl', 'compileDe
bugAndroidTestAidl', 'compileDebugAndroidTestJava', 'compileDebugAndroidTestNdk'
, 'compileDebugAndroidTestRenderscript', 'compileDebugAndroidTestSources', 'comp
ileDebugJava', 'compileDebugNdk', 'compileDebugRenderscript', 'compileDebugSourc
es', 'compileDebugUnitTestJava', 'compileDebugUnitTestSources'.

 at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
     at org.gradle.launcher.GradleMain.main(GradleMain.java:23)

    at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:33)

     at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)

    at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)

gradlew compileDebug :

FAILURE: Build failed with an exception.

• What went wrong: Task 'compileDebug' is ambiguous in root project 'MyApp'. Candidates are: 'compileDebugAidl', 'compileDebugAndroidTestAidl', 'compileDebugAndroidTest Java', 'compileDebugAndroidTestNdk', 'compileDebugAndroidTestRenderscript', 'com pileDebugAndroidTestSources', 'compileDebugJava', 'compileDebugNdk', 'compileDeb ugRenderscript', 'compileDebugSources', 'compileDebugUnitTestJava', 'compileDebu gUnitTestSources'.

NOTE: I cannot run sdk manager.

Answer 1

I think the problem is the value of your applicationId in the build.gradle . It should contain the fully qualified package name of your application because it will be the identifier used by the system to install your app. "/**/" looks like a really conflicting name for the dex packaging.