android - Error login to server with volley -

i have problem login. force stop when login button click.

this code :

//initializing views     edittextemail = (edittext) findviewbyid(r.id.edemail);     edittextpassword = (edittext) findviewbyid(r.id.edpassword);      btlogin = (button) findviewbyid(r.id.btlogin);     btlogin.setonclicklistener(this);      ((textview) findviewbyid(r.id.btdaftar))     .setonclicklistener(new onclicklistener() {           public void onclick(view v) {             loginactivity.this.startactivity(new intent(loginactivity.this,signupactivity.class));         }     }); }  @override protected void onresume() {     super.onresume();     //in onresume fetching value sharedpreference     sharedpreferences sharedpreferences = getsharedpreferences(config.shared_pref_name,context.mode_private);      //fetching boolean value form sharedpreferences     loggedin = sharedpreferences.getboolean(config.loggedin_shared_pref, false);      //if true     if(loggedin){         //we start profile activity         intent intent = new intent(loginactivity.this, mainactivity.class);         startactivity(intent);     } }  private void login(){     final string email = edittextemail.gettext().tostring().trim();     final string password = edittextpassword.gettext().tostring().trim();      stringrequest stringrequest = new stringrequest(request.method.post, config.login_url,             new response.listener<string>() {                 @override                 public void onresponse(string response) {                     if(response.trim().equalsignorecase(config.login_success)){                         sharedpreferences sharedpreferences = loginactivity.this.getsharedpreferences(config.shared_pref_name, context.mode_private);                          sharedpreferences.editor editor = sharedpreferences.edit();                          editor.putboolean(config.loggedin_shared_pref, true);                         editor.putstring(config.email_shared_pref, email);                         editor.commit();                          intent intent = new intent(loginactivity.this, mainactivity.class);                         intent.setflags(intent.flag_activity_clear_top);                         intent.putextra("exit me", true);                         startactivity(intent);                         finish();                      }else{                          toast.maketext(loginactivity.this, "invalid username or password", toast.length_long).show();                     }                 }             },             new response.errorlistener() {                 @override                 public void onerrorresponse(volleyerror error) {                     }             }){         @override         protected map<string, string> getparams() throws authfailureerror {             map<string,string> params = new hashmap<>();             //adding parameters request             params.put(config.key_email, email);             params.put(config.key_password, password);              //returning parameter             return params;         }     };      //adding string request queue     requestqueue requestqueue = volley.newrequestqueue(this);     requestqueue.add(stringrequest); }  @override public void onclick(view v) {     login(); } 

the log cat is:

11-13 06:05:07.990: e/androidruntime(13864): fatal exception: main 11-13 06:05:07.990: e/androidruntime(13864): process: com.example.mdesigntemp, pid: 13864 11-13 06:05:07.990: e/androidruntime(13864): java.lang.noclassdeffounderror: com.example.mdesigntemp.loginactivity$4 11-13 06:05:07.990: e/androidruntime(13864): @ com.example.mdesigntemp.loginactivity.login(loginactivity.java:84) 11-13 06:05:07.990: e/androidruntime(13864): @ com.example.mdesigntemp.loginactivity.onclick(loginactivity.java:134) 11-13 06:05:07.990: e/androidruntime(13864): @ android.view.view.performclick(view.java:4783) 11-13 06:05:07.990: e/androidruntime(13864): @ android.view.view$performclick.run(view.java:19887) 11-13 06:05:07.990: e/androidruntime(13864): @ android.os.handler.handlecallback(handler.java:739) 11-13 06:05:07.990: e/androidruntime(13864): @ android.os.handler.dispatchmessage(handler.java:95) 11-13 06:05:07.990: e/androidruntime(13864): @ android.os.looper.loop(looper.java:135) 11-13 06:05:07.990: e/androidruntime(13864): @ android.app.activitythread.main(activitythread.java:5290) 11-13 06:05:07.990: e/androidruntime(13864): @ java.lang.reflect.method.invoke(native method) 11-13 06:05:07.990: e/androidruntime(13864): @ java.lang.reflect.method.invoke(method.java:372) 11-13 06:05:07.990: e/androidruntime(13864): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:911) 11-13 06:05:07.990: e/androidruntime(13864): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:706)

it says error in

    stringrequest stringrequest = new stringrequest(request.method.post, config.login_url, new response.listener<string>() { 

i don't know fault. do mistake? every answer helpful me. in advance

update code here:

(textview)findviewbyid(r.id.btdaftar) 

like:

textview tx = (textview)findviewbyid(r.id.btdaftar); tx.setonclicklistener(this); 

and override onclick() method.