Traté de encontrar algo para mí, pero no me ayudó.

Este es mi archivo gradle:

 dependencies { compile fileTree(include: ['*.jar'], dir: 'libs') compile project(path: ':slideDateTimePicke') compile('com.crashlytics.sdk.android:crashlytics:2.6.7@aar') { transitive = true; } compile 'com.android.support:support-v4:25.3.1' compile 'com.android.support:appcompat-v7:25.3.1' compile 'com.android.support:design:25.3.1' compile 'com.android.support:cardview-v7:25.3.1' compile 'com.google.code.gson:gson:2.7' compile 'com.squareup.retrofit2:retrofit:2.1.0' compile 'com.squareup.retrofit2:converter-gson:2.1.0' compile 'com.squareup.okhttp3:logging-interceptor:3.3.1' compile 'com.facebook.stetho:stetho-okhttp3:1.4.2' compile 'cn.pedant.sweetalert:library:1.3' compile 'com.github.bumptech.glide:glide:3.7.0' compile 'uk.co.chrisjenx:calligraphy:2.2.0' compile 'com.daimajia.slider:library:1.1.5@aar' compile 'com.nineoldandroids:library:2.4.0' compile 'com.google.android.gms:play-services-maps:10.2.1' compile 'com.google.android.gms:play-services-vision:10.2.1' compile 'com.google.firebase:firebase-messaging:10.2.1' compile 'com.google.zxing:core:3.2.0' compile 'com.makeramen:roundedimageview:2.2.1' compile 'org.florescu.android.rangeseekbar:rangeseekbar-library:0.3.0' compile 'com.android.support:multidex:1.0.1' compile 'com.jakewharton:butterknife:8.5.1' compile 'com.android.support.constraint:constraint-layout:1.0.1' annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1' }

Y este es mi código:

 private static OkHttpClient createClient() { return new OkHttpClient.Builder() .addInterceptor(createLoggingInterceptor()) .build(); } private static HttpLoggingInterceptor createLoggingInterceptor() { HttpLoggingInterceptor logging = new HttpLoggingInterceptor(); logging.setLevel(HttpLoggingInterceptor.Level.BASIC); return logging; }

¿Dónde está el error?