Error: java.lang.NullPointerException (no error message)

At the moment of pressing play on android studio

I really do not know where the dilemma is because it does not specify much ...

Gradle

  apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "com.example.hp14.iteracion2"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }


}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile files('libs/volley.jar')
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.android.support:design:23.3.0'
    compile 'com.android.support:support-v4:23.3.0'
    compile 'com.loopj.android:android-async-http:1.4.9'
    compile 'de.keyboardsurfer.android.widget:crouton:1.8.5@aar'
    compile 'com.google.android.gms:play-services:8.4.0'
    testCompile 'junit:junit:4.12'
    compile 'com.squareup.picasso:picasso:2.5.2'
    compile files('libs/glide-3.7.0.jar')
    compile 'com.android.support:recyclerview-v7:23.3.0'
    compile 'com.android.volley:volley:1.0.0'
    compile 'com.github.bumptech.glide:glide:3.7.0'
    compile 'com.android.support:cardview-v7:23.3.0'
}