How to fix noClassDefFoundError: com.facebook.android.facebook -


integrating facebook sdk android app.before integrating app working fine once working facebook app stopped unexpectedly here placing code.suggest me how fix this

public class mainactivity extends activity implements onclicklistener {      button btntologin, btntopost, logout;     string app_id;     facebook fb;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         app_id = "308180782571605";         fb = new facebook(app_id);          try {             btntologin = (button) findviewbyid(r.id.button1);             btntopost = (button) findviewbyid(r.id.button2);             logout = (button) findviewbyid(r.id.button3);             btntologin.setonclicklistener(this);             btntopost.setonclicklistener(this);             logout.setonclicklistener(this);         } catch (exception e) {             // todo auto-generated catch block             e.printstacktrace();         }     }

here logs

08-15 22:08:52.531: e/androidruntime(2151): fatal exception: main 08-15 22:08:52.531: e/androidruntime(2151): java.lang.noclassdeffounderror: com.facebook.android.facebook 08-15 22:08:52.531: e/androidruntime(2151):     @ com.sri.z4globalsoft.mainactivity.oncreate(mainactivity.java:25) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.app.activity.performcreate(activity.java:4465) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1049) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.app.activitythread.performlaunchactivity(activitythread.java:1919) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.app.activitythread.handlelaunchactivity(activitythread.java:1980) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.app.activitythread.access$600(activitythread.java:122) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.app.activitythread$h.handlemessage(activitythread.java:1146) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.os.handler.dispatchmessage(handler.java:99) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.os.looper.loop(looper.java:137) 08-15 22:08:52.531: e/androidruntime(2151):     @ android.app.activitythread.main(activitythread.java:4340) 08-15 22:08:52.531: e/androidruntime(2151):     @ java.lang.reflect.method.invokenative(native method) 08-15 22:08:52.531: e/androidruntime(2151):     @ java.lang.reflect.method.invoke(method.java:511) 08-15 22:08:52.531: e/androidruntime(2151):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:784) 08-15 22:08:52.531: e/androidruntime(2151):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:551) 08-15 22:08:52.531: e/androidruntime(2151):     @ dalvik.system.nativestart.main(native method)

go project -> properties -> java build path -> order & export , make sure facebook library ticked.


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