java - Android Studio: Session 'MainActivity': error, but there is no error -


hi have been racking brain hours, did research online nobody seems have answer. emulator running code no problem ran again , "session 'mainactivity': error". looked through main activity 10 times there no error sign anywhere , looks should working fine, mean working before no problem. i'm not sure if there problem don't see android studio not pointing out or if different problem together.

any appreciated. thank you.

package tekvision.codedecrypter; import android.content.context; import android.content.intent; import android.support.v7.app.actionbaractivity; import android.os.bundle; import android.view.view; import android.view.windowmanager; import android.widget.button; import android.widget.toast; import gameinfo.gamedatabase;  public class mainactivity extends actionbaractivity {      //runs before application created     private button mcampaignbutton;     private final context context = this;      //when application created     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);      //instantiate gamedatabase object (this activity)     final gamedatabase gdb = new gamedatabase(context);      gdb.fillgamedatabase();      //keeps screen on doesn't fall asleep     getwindow().addflags(windowmanager.layoutparams.flag_keep_screen_on);      //finding button button id after application created     mcampaignbutton = (button)findviewbyid(r.id.campaignbuttonid);      //checks if campaign button clicked     mcampaignbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {              string ans =  gdb.getanswer("ancient",1);              //toast pop message             toast toast = toast.maketext(getapplicationcontext(),                  ans ,                     toast.length_short);              toast.show();               //intent go main activity campaign level select activity              final intent intent = new intent(mainactivity.this, campaignselectlevel.class);              startactivity(intent);          }     });  } 

}

try rebuilding , cleaning project. build > rebuild project , build > clean project


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