安装XCode命令行工具失败

Question

我正在尝试在Yosemite上安装命令行工具但是我收到以下错误：

apply plugin: 'com.android.application'

android {

dexOptions {
    javaMaxHeapSize "4g"
    jumboMode = true
}
compileSdkVersion 21
buildToolsVersion '22.0.1'
defaultConfig {
    applicationId "my.package.app"
    minSdkVersion 19
    targetSdkVersion 19
    versionCode 1
    versionName "1.0"
    multiDexEnabled=true

}
packagingOptions {
    exclude 'META-INF/LICENSE.txt'
}
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_7
    targetCompatibility JavaVersion.VERSION_1_7
}
productFlavors {
}

}
repositories {
mavenLocal()
mavenCentral()

}

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:21.0.3'
compile 'com.google.code.gson:gson:2.2.4'
compile 'joda-time:joda-time:2.3'
compile project(':HelpShift')
compile files('libs/gcm.jar')
}

导致此错误的原因是什么？如何解决？