ios - error while trying to upload image with NSURLSession -


i'm using following code upload , image:

- (ibaction)uploadpic:(uibutton *)sender {     phfetchresult *result = [phasset fetchassetswithalasseturls:@[self.imagereferenceurl] options:nil];     phasset *asset = [result firstobject];     if (asset) {         phimagemanager *manager = [phimagemanager defaultmanager];         [manager requestimagedataforasset:asset options:nil resulthandler:^(nsdata *imagedata, nsstring *datauti, uiimageorientation orientation, nsdictionary *info) {         // upload `imagedata`              nsurl *fileurl = info[@"phimagefileurlkey"];             nsstring *filename = [fileurl lastpathcomponent];             nsstring *mimetype = [self mimetypeforpath:filename];              nsstring *urlstring = @"url";              nsmutableurlrequest* request= [nsmutableurlrequest requestwithurl:[nsurl urlwithstring:urlstring]];             [request sethttpmethod:@"post"];             nsstring *boundary = @"---------------------------14737809831466499882746641449";             nsstring *contenttype = [nsstring stringwithformat:@"multipart/form-data; boundary=%@",boundary];             [request addvalue:contenttype forhttpheaderfield: @"content-type"];             nsmutabledata *postbody = [nsmutabledata data];             [postbody appenddata:[[nsstring stringwithformat:@"\r\n--%@\r\n",boundary] datausingencoding:nsutf8stringencoding]];             [postbody appenddata:[[nsstring stringwithformat:@"content-disposition: form-data; name=\"uploaded_file\"; filename=\"%@\"\r\n", filename] datausingencoding:nsutf8stringencoding]];             [postbody appenddata:[[nsstring stringwithformat:@"content-type: %@\r\n\r\n", mimetype] datausingencoding:nsutf8stringencoding]];             [postbody appenddata:imagedata];             [postbody appenddata:[[nsstring stringwithformat:@"\r\n--%@--\r\n",boundary] datausingencoding:nsutf8stringencoding]];              nsurlsessiontask *task = [[nsurlsession sharedsession] uploadtaskwithrequest:request fromdata:postbody completionhandler:^(nsdata *data, nsurlresponse *response, nserror *error) {                 nsstring *responsestring = [[nsstring alloc] initwithdata:data encoding:nsutf8stringencoding];             nslog(@"response  %@",responsestring);         }];             [task resume];         }];     } }  - (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info {     uiimage *chosenimage = info[uiimagepickercontrollereditedimage];     self.imageview.image = chosenimage;     self.imagereferenceurl = info[uiimagepickercontrollerreferenceurl];      [picker dismissviewcontrolleranimated:yes completion:nil]; }

and got error:

2015-09-30 10:35:42.921 udazz[874:453021] * terminating app due uncaught exception 'nsinvalidargumentexception', reason: '* -[__nsplaceholderarray initwithobjects:count:]: attempt insert nil object objects[0]' *** first throw call stack: (0x183804f5c 0x198307f80 0x1836ee30c 0x1836f9db4 0x100020240 0x188d923e4 0x188d92360 0x188d7ac88 0x188d91c78 0x188d918a8 0x188d8aadc 0x188d5ba2c 0x188d59f18 0x1837bc5a4 0x1837bc038 0x1837b9d38 0x1836e8dc0 0x18e83c088 0x188dc2f60 0x1000315a4 0x198b328b8) libc++abi.dylib: terminating uncaught exception of type nsexception


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