SIGABRT terminating an app due to uncaught exception

Question

I'm trying to retrieve data from web service and then filter the data and store it in another array based on a value. However, I get the following error whenever I try to filter it:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary Month]: unrecognized selector sent to instance 0x174079640'

This is my code:

- (void)getDataHTTPClient:(Client *)client didUpdateWithData:(id)data
{
    [self.view setUserInteractionEnabled:YES];

    if (isPullRefresh)
    {
        isPullRefresh = NO;
        [datasource removeAllObjects];
        [self.pullToRefreshView finishLoading];
    }

    NSMutableArray *array = (NSMutableArray *)data;
    if (![array count])
    {
        isNewsEnded = YES;
        [self.tableView reloadData];
        return;
    }
    [hud hide:YES];

    [datasource addObjectsFromArray:(NSMutableArray *) data];
    NSDate *currentDate = [NSDate date];
    NSCalendar* calendar = [NSCalendar currentCalendar];
    NSDateComponents* components = [calendar         components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:currentDate];
    monthInt= [components month];
    NSLog(@"month %li", monthInt);
    NSLog(@"month after deduction %li", monthInt-1);

    monthString = [NSString stringWithFormat:@"%zd",monthInt];

    for (EventsBean *item in datasource)
    {
        if([item.Month isEqualToString:monthString])
        {
            [filteredArray addObject:item];
        }
    }
    [self.tableView reloadData];

    if ([datasource count])
    {
        [self displayNoRecordMSG:NO];
    }
    else
    {
        [self displayNoRecordMSG:YES];
    }
}

the error shows on this line

 if([item.Month isEqualToString:monthString])
{
    [filteredArray addObject:item];
}

Answer 1

The data you received over the network will most likely not be an instance of EventsBean class. From the error log, it looks like it is actually a NSDictionary object. I'm guessing it is already parsed from a JSON string for you. So I would probably try to access the month property by doing item[@"Month"] instead.