Android: unable to lauch new Activity from an inner class -

android: help: notice kind of question has been asked before other people answers have not been useful my case; need launch new activity inner class error bellow:

04-05 15:00:43.851: e/androidruntime(3288): caused by: java.lang.instantiationexception: com.school.school$studentprofile 

here code snippet:

public class school extends activity{ progressdialogue progressdialogue;  protected webviewtask _webtask;  string path = "http://www.school.com/student/";   @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.school);       progressdialogue = new progressdialogue(school.this);      _webtask = new webviewtask();     _webtask.execute();  }     //rest of code    /** inner class */  public class studentprofile {     context context;       /** instantiate interface , set context */      public studentprofile(context c) {          context=c;         }      /** launch student activity */     public void lauchprofile() {           school.this.startactivity(new intent(school.this, studentprofile.class));         //intent intent = new intent(school.this, studentprofile.class);          //startactivity(intent);      } }     void webview(){     string url = path +"student.php";         webview wv = (webview) findviewbyid(r.id.trivia_webview);     websettings websettings = wv.getsettings();     websettings.setjavascriptenabled(true);      wv.addjavascriptinterface(new studentprofile (this), "student");      wv.loadurl(url);      wv.setwebviewclient(new webviewclient() {         @override         public boolean shouldoverrideurlloading(webview view, string url) {             // open url in web view             if (url.contains(url))                 return super.shouldoverrideurlloading(view, url);             // open url in external web browser             else {                  return true;             }         }     }); }  // rest of code 

note: there 'student' button on web view supposed launch studentprofile activity.

your studentprofile not activity, can not start way. needs separate class, , declared in androidmanifest.xml.