相关疑难解决方法(0)

从我上一个项目更新后出现错误.我的代码不是问题,但我在build.gradle时遇到问题.我该如何解决？

build.gradle代码在这里:

apply plugin: 'android'

android {
    compileSdkVersion 21
    buildToolsVersion '20.0.0'

    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/ASL2.0'
    }

    defaultConfig {
        applicationId 'com.xxx.axxx'
        minSdkVersion 14
        targetSdkVersion 19
        versionCode 6
        versionName '1.0'
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:19.+'
    compile files('libs/commons-codec-1.8.jar')
    compile files('libs/asmack-android-8-4.0.4.jar')
    compile 'com.android.support:support-v4:21.0.0'
    compile 'com.google.code.gson:gson:2.2.4'
    compile 'com.jakewharton:butterknife:5.1.1'
}

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