ios - Terminating App - NSInvalidArgumentException -

crashing when running parse anypic code.

-(void)sendcommentbutton:(id) sender {         nsstring *trimmedcomment = [commenttextview.text stringbytrimmingcharactersinset:[nscharacterset whitespacecharacterset]];         if (trimmedcomment.length != 0 && [self.photo objectforkey:kpapphotouserkey]) {             pfobject *comment = [pfobject objectwithclassname:kpapactivityclasskey];             [comment setobject:trimmedcomment forkey:kpapactivitycontentkey]; // set comment text             [comment setobject:[self.photo objectforkey:kpapphotouserkey] forkey:kpapactivitytouserkey]; // set touser             [comment setobject:[pfuser currentuser] forkey:kpapactivityfromuserkey]; // set fromuser             [comment setobject:kpapactivitytypecomment forkey:kpapactivitytypekey];             [comment setobject:self.photo forkey:kpapactivityphotokey];             [comment setobject:self.photofile forkey:@"attachmentfile"];               pfacl *acl = [pfacl aclwithuser:[pfuser currentuser]];             [acl setpublicreadaccess:yes];             [acl setwriteaccess:yes foruser:[self.photo objectforkey:kpapphotouserkey]];             comment.acl = acl;              [[papcache sharedcache] incrementcommentcountforphoto:self.photo];              // show hud view             [mbprogresshud showhudaddedto:self.view.superview animated:yes];              // if more 5 seconds pass since post comment, stop waiting server respond             nstimer *timer = [nstimer scheduledtimerwithtimeinterval:5.0f target:self selector:@selector(handlecommenttimeout:) userinfo:@{@"comment": comment} repeats:no];              [comment saveeventually:^(bool succeeded, nserror *error) {                 [timer invalidate];                  if (error && error.code == kpferrorobjectnotfound) {                     [[papcache sharedcache] decrementcommentcountforphoto:self.photo];                     uialertview *alert = [[uialertview alloc] initwithtitle:nslocalizedstring(@"could not post comment", nil) message:nslocalizedstring(@"this photo no longer available", nil) delegate:nil cancelbuttontitle:nil otherbuttontitles:@"ok", nil];                     [alert show];                     [self.navigationcontroller popviewcontrolleranimated:yes];                 }                  [[nsnotificationcenter defaultcenter] postnotificationname:papphotodetailsviewcontrollerusercommentedonphotonotification object:self.photo userinfo:@{@"comments": @(self.objects.count + 1)}];                  [mbprogresshud hidehudforview:self.view.superview animated:yes];                 [self loadobjects];             }];          }          [self.commenttextview settext:@""];         [self.commenttextview resignfirstresponder];         if (self.photofile != nil) {             self.photofile = nil;         }   } 

picking image

- (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info {     nslog(@"hello");     uiimage *img = [info objectforkey:uiimagepickercontrolleroriginalimage];       // jpeg decrease file size , enable faster uploads & downloads     nsdata *imagedata = uiimagejpegrepresentation(img, 0.8f);      self.photofile = [pffile filewithdata:imagedata];      // request background execution task allow finish uploading photo if app backgrounded     self.fileuploadbackgroundtaskid = [[uiapplication sharedapplication] beginbackgroundtaskwithexpirationhandler:^{         [[uiapplication sharedapplication] endbackgroundtask:self.fileuploadbackgroundtaskid];     }];      nslog(@"requested background expiration task id %lu anypic photo upload", (unsigned long)self.fileuploadbackgroundtaskid);     [self.photofile saveinbackgroundwithblock:^(bool succeeded, nserror *error) {         if (succeeded) {             nslog(@"photo uploaded successfully");             uialertview *alert = [[uialertview alloc] initwithtitle:@"photo uploaded"                                                             message:@"successfully"                                                            delegate:self                                                   cancelbuttontitle:@"ok"                                                   otherbuttontitles:nil];             [alert show];         } else {              [[uiapplication sharedapplication] endbackgroundtask:self.fileuploadbackgroundtaskid];          }     }];      [self dismissviewcontrolleranimated:yes completion:nil]; } 

question: why crashing? believe code crashing it. did crash not add attachmentfile , put comment.

if need more code or need clarifications please comment down below

pfobject *comment = [pfobject objectwithclassname:kpapactivityclasskey]; [comment setobject:trimmedcomment forkey:kpapactivitycontentkey]; // set comment text [comment setobject:[self.photo objectforkey:kpapphotouserkey] forkey:kpapactivitytouserkey]; // set touser [comment setobject:[pfuser currentuser] forkey:kpapactivityfromuserkey]; // set fromuser [comment setobject:kpapactivitytypecomment forkey:kpapactivitytypekey]; [comment setobject:self.photo forkey:kpapactivityphotokey]; [comment setobject:self.photofile forkey:@"attachmentfile"]; 

in 1 of these lines, you're passing nil first parameter of setobject:forkey. add exception breakpoint (in breakpoints tab of left sidebar) , check line breaks on.