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java.lang.VerifyError: Rejecting class c.a.a.f.b.i that attempts to sub-class erroneous class c.a.a.f.b.a (declaration of 'c.a.a.f.b.i' appears in /data/app/com.example.android_javed.plp_calculator2-2/base.apk)	at d.f.a(Unknown Source)	at com.example.android_javed.plp_calculator2.fm.a(Unknown Source)	at com.example.android_javed.plp_calculator2.fm.doInBackground(Unknown Source)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)