objective c - "unrecognized selector sent to instance" crash -


i've got trouble ui_user_interface_idiom() here

- (void)viewdidload {     [super viewdidload];     self.footercommentactivity = self.commentactivity;     self.footernewsactivity = self.newsactivity;      [self.othernews settablefooterview:nil];     [self.commenttableview settablefooterview:nil];      if (ui_user_interface_idiom() == uiuserinterfaceidiomphone) {         html = [nsstring stringwithformat:@"<html style='-webkit-text-size-adjust: none;'><head><style>p {margin:0px 0px 10px;padding:0;}</style></head><body style='background-color:transparent;padding:0;margin:0;'>%@</body></html>", self.postcontenttext];     } else if (ui_user_interface_idiom() == uiuserinterfaceidiompad) {         html = [nsstring stringwithformat:@"<html style='-webkit-text-size-adjust: none;'><head><style>p {margin:0px 0px 10px;padding:0;}</style></head><body style='background-color:transparent;padding:0;margin:0;-webkit-column-count:2;'>%@</body></html>", self.postcontenttext];     }     [self.postcontent loadhtmlstring:html baseurl:nil];         self.loadmorecomments = false;     self.loadmorenews = false; }

update code no 2: ive changed code viewdidappear function, still crashed

- (void)viewdidappear:(bool)animated {     [super viewdidappear:animated];     shareddata = [nsuserdefaults standarduserdefaults];      nsmutablearray *temparray = [nsmutablearray arraywitharray:self.othernewsarray];      (int =0; < temparray.count; i++) {         post *othernewspost = [temparray objectatindex:i];         if (othernewspost.postid == self.postid) {             [temparray removeobjectatindex:i];             break;         }     }     self.othernewsarraywithoutcurrentpost = [temparray copy];       //update height of main image, text, video.     nslog(@"post image: %@",self.postimagename);      if (self.postimagename == nil) {         self.postimage.image = nil;         cgrect imageframe = self.postimage.frame;         imageframe.size.height = 0.0f;         self.postimage.frame = imageframe;          cgrect f = self.postcontent.frame;         f.origin.x = 0; // new x         f.origin.y = 0; // new y         self.postcontent.frame = f;      } else {          [self.postimage setimagewithurl:[nsurl urlwithstring:self.postimagename]                        placeholderimage:[uiimage imagenamed:@"postimage-placeholder"]];   //        self.postimage.image = [uiimage imagenamed:self.postimagename];     }     nsstring *htmlstring = @"";     if (self.columns == false) {         htmlstring = [nsstring stringwithformat:@"<html style='-webkit-text-size-adjust: none;'><head><style>p {margin:0px 0px 10px;padding:0;}</style></head><body style='background-color:transparent;padding:0;margin:0;'>%@</body></html>", self.postcontenttext];         [self.postcontent loadhtmlstring:htmlstring baseurl:nil];     } else {         htmlstring = [nsstring stringwithformat:@"<html style='-webkit-text-size-adjust: none;'><head><style>p {margin:0px 0px 10px;padding:0;}</style></head><body style='background-color:transparent;padding:0;margin:0;-webkit-column-count:2;'>%@</body></html>", self.postcontenttext];         [self.postcontent loadhtmlstring:htmlstring baseurl:nil];     }     [self.commenttableview reloaddata];     [self.othernews reloaddata];      if (self.othernews.hidden) {         [self adjustviewheightfortable:self.commenttableview];     } else {         [self adjustviewheightfortable:self.othernews];     }      [self markasread];      [self loadpost]; }

when app start , start login app, getting crashed i'm using ipad simulator here

 *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[session status]: unrecognized selector sent instance 0x8889890' *** first throw call stack:


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