android - NetworkDispatcher.run: Unhandled exception java.lang.NullPointerException -


i trying run below code send request on web server api using volley library make web server hit functions. check code , tell ma problem

    private void makeloginrequest(string memail, string mpassword) {         string urljsonobj = constants.weburls.baseurl + constants.baseurlprefix.dgetlogin;         showpdialog();         map<string, string> params = new hashmap<string, string>();         params.put("email", memail);         params.put("password", mpassword);         params.put("signature", utility.getmd5signaturemain(this));         params.put("ts", utility.gettimestamp());         params.put("client_id", constants.clientid);         params.put("platforms", constants.plateform);    appcontroller.getinstance().getsharedprefrence().getprefskeyobjectid(this));         params.put("parse_installation", appcontroller.getinstance().getsharedprefrence().getdprefskeyinstallationid(this));           customrequest jsobjrequest = new customrequest(request.method.post, urljsonobj, params, this.createrequestsuccesslistener(), this.createrequesterrorlistener());      }       public response.listener<jsonobject> createrequestsuccesslistener() {         response.listener<jsonobject> reponselistener;         reponselistener = new response.listener<jsonobject>() {             @override             public void onresponse(jsonobject jsonobject) {                 try {                     if (jsonobject != null)                         parselogin(jsonobject);                     else{                         log.e("abc","def");                     }                 } catch (jsonexception e) {                     e.printstacktrace();                 }                 hidepdialog();               }         };         return reponselistener;     }      response.errorlistener createrequesterrorlistener() {         response.errorlistener errorlistener;         errorlistener = new response.errorlistener() {             @override             public void onerrorresponse(volleyerror volleyerror) {                 volleyerror.printstacktrace();                 hidepdialog();                 if (volleyerror.networkresponse == null) {                     if (volleyerror.getclass().equals(timeouterror.class)) {                         // show timeout error message                         toast.maketext(dloginactivity.this,                                 "oops. timeout error!",                                 toast.length_short).show();                      }                     if ( volleyerror.getclass().equals(noconnectionerror.class)) {                     // show timeout error message                         toast.maketext(dloginactivity.this,                         "no internet connection! try again later",                         toast.length_short).show();                     }                 }             }         };         return errorlistener;     }

but getting following error:

e/volley: [4189] networkdispatcher.run: unhandled exception java.lang.nullpointerexception java.lang.nullpointerexception @ libcore.net.uricodec.encode(uricodec.java:132) @ java.net.urlencoder.encode(urlencoder.java:57) @ com.android.volley.request.encodeparameters(request.java:449) @ com.android.volley.request.getbody(request.java:435) @ com.android.volley.toolbox.hurlstack.addbodyifexists(hurlstack.java:236) @ com.android.volley.toolbox.hurlstack.setconnectionparametersforrequest(hurlstack.java:210) @ com.android.volley.toolbox.hurlstack.performrequest(hurlstack.java:106) @ com.android.volley.toolbox.basicnetwork.performrequest(basicnetwork.java:93) @ com.android.volley.networkdispatcher.run(networkdispatcher.java:110)

i have no idea problem. can help? in advance.


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