Error:Execution failed for task ':app:mergeDebugResources'. > Error: Some file crunching failed, see

apply plugin: 'com.android.application'android {    compileSdkVersion 25    buildToolsVersion "26.0.2"    aaptOptions.cruncherEnabled = false    aaptOptions.useNewCruncher = false    defaultConfig {        applicationId "demo.ligong.sdut.hellomath"        minSdkVersion 17        targetSdkVersion 25        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {        exclude group: 'com.android.support', module: 'support-annotations'    })    compile 'com.android.support:appcompat-v7:25.3.1'    compile 'com.android.support.constraint:constraint-layout:1.0.2'    testCompile 'junit:junit:4.12'}