android - App is crashing Java.lang.NoClassDefFoundError: com.abhi.barcode.frag.libv2.R$string -


hello have problem suffering week.app built on fragments when open fragment qrcode reader works fine switch other , again, error occurs.i think maybe wrong method ondestroy , oncreateview 

fatal exception: main java.lang.noclassdeffounderror: com.abhi.barcode.frag.libv2.r$string         @ com.abhi.barcode.frag.libv2.barcodefragment.displayframeworkbugmessageandexit(barcodefragment.java:345)         @ com.abhi.barcode.frag.libv2.barcodefragment.initcamera(barcodefragment.java:338)         @ com.abhi.barcode.frag.libv2.barcodefragment.surfacecreated(barcodefragment.java:212)         @ android.view.surfaceview.updatewindow(surfaceview.java:559)         @ android.view.surfaceview.access$000(surfaceview.java:82)         @ android.view.surfaceview$3.onpredraw(surfaceview.java:172)         @ android.view.viewtreeobserver.dispatchonpredraw(viewtreeobserver.java:671)         @ android.view.viewrootimpl.performtraversals(viewrootimpl.java:1822)         @ android.view.viewrootimpl.dotraversal(viewrootimpl.java:1002)         @ android.view.viewrootimpl$traversalrunnable.run(viewrootimpl.java:4216)         @ android.view.choreographer$callbackrecord.run(choreographer.java:736)         @ android.view.choreographer.docallbacks(choreographer.java:566)         @ android.view.choreographer.doframe(choreographer.java:536)         @ android.view.choreographer$framedisplayeventreceiver.run(choreographer.java:722)         @ android.os.handler.handlecallback(handler.java:615)         @ android.os.handler.dispatchmessage(handler.java:92)         @ android.os.looper.loop(looper.java:137)         @ android.app.activitythread.main(activitythread.java:4745)         @ java.lang.reflect.method.invokenative(native method)         @ java.lang.reflect.method.invoke(method.java:511)         @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786)         @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553)         @ dalvik.system.nativestart.main(native method)       @override         public view oncreateview(layoutinflater inflater, viewgroup container,                                  bundle savedinstancestate) {             if (view != null) {                 viewgroup parent = (viewgroup) view.getparent();                 if (parent != null)                     parent.removeview(view);             }         try {             view= inflater.inflate(r.layout.fragment_qr, container, false);         }catch (inflateexception e) {          }     @override     public void ondestroyview() {         super.ondestroyview();    fragment f = getchildfragmentmanager().findfragmentbyid(r.id.qr_scan_fragment);         if (f != null) {             getactivity().getsupportfragmentmanager().begintransaction()                     .remove(f)                     .commit();         }       }

it 90% missing jar or false binding project check oput preferences of project , maybe need more stuff go documentation of library using there must says how bind library right

for example had add lines project.properties file


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