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                                            ucargames

NullPointerException

I'm using this in onCreate and getting crash. **MainActivity.java** `ViewGroup viewGroup = (ViewGroup) findViewById(R.id.nav); Blurry.with(this).radius(25).sampling(2).onto(viewGroup);` **activity_main.xml** `` **LogCat** `08-31 15:04:31.126 25687-25687/de.test.demo E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity...