NoClassDefFoundError on Calligraphy library

If you support API levels under 21, your Application class should extend MultiDexApplication from the support library.

class MyApplication extends MultiDexApplication

If you do not have a custom Application class, than you should add the MultiDexApplication class to your manifest directly

<application    android:name="android.support.multidex.MultiDexApplication"></application>

See https://developer.android.com/tools/building/multidex.html

If your application extends from Application then override attachBaseContext inside Application i.e

@Overrideprotected void attachBaseContext(Context base) {    super.attachBaseContext(base);    MultiDex.install(this);}

Also need to add dependency

compile 'com.android.support:multidex:1.0.1'

Goodlife is here again to the rescue .Add this line to ur java file that extends application.

 public void onCreate() {    super.onCreate();    mInstance = this;    //ADD MULTIDEX.INSTALL(THIS) SOLVED MY SIMILAR PROBLEM    MultiDex.install(this);    CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()                    .setDefaultFontPath("fonts/Roboto-Regular.ttf")                    .setFontAttrId(R.attr.fontPath)                    .build()    );}