JSON Thumbnail image in Custom Table View Cell - ios

Question

I really get tired of trying to fix this so I think I need some help. I am filling each Cells of my iOS from an API which I successfully parsed (Can retrieve simple things such as texts, or numbers with no problem)
But when I tried to set the images for the thumbnails I am having some errors.
This is my code:
NSString *imageUrl = [tempDictionary valueForKeyPath:#"files.url_thumb"];
NSURL *url = [NSURL URLWithString:imageUrl];
NSData *imageData = [NSData dataWithContentsOfURL:url];
UIImage *thumbNailImage = [UIImage imageWithData:imageData];
dispatch_async(dispatch_get_main_queue(), ^{
[cell.ThumbImage setImage:thumbNailImage];
});
and this are the nightmares in my console:
2015-04-08 13:14:26.450 WebTableView[4976:173380] -[__NSArrayI length]:
unrecognized selector sent to instance 0x79e18b90
2015-04-08 13:14:26.509 WebTableView[4976:173380] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI length]: unrecognized selector sent to instance 0x79e18b90'
*** First throw call stack:
(
0 CoreFoundation 0x036c9466 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x03352a97 objc_exception_throw + 44
2 CoreFoundation 0x036d12c5 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277
3 CoreFoundation 0x03619bc7 ___forwarding___ + 1047
4 CoreFoundation 0x0361978e _CF_forwarding_prep_0 + 14
5 CoreFoundation 0x035836cf CFStringGetLength + 143
6 CoreFoundation 0x036a9c8d _CFURLCreateWithURLString + 77
7 CoreFoundation 0x035952d3 CFURLCreateWithString + 35
8 Foundation 0x02f17999 -[NSURL(NSURL) initWithString:relativeToURL:] + 371
9 Foundation 0x02f17807 +[NSURL(NSURL) URLWithString:relativeToURL:] + 80
10 Foundation 0x02f177b1 +[NSURL(NSURL) URLWithString:] + 48
11 WebTableView 0x00111a8b -[TableViewController tableView:cellForRowAtIndexPath:] + 571
12 UIKit 0x01c26c9c -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 473
13 UIKit 0x01c26d7e -[UITableView _createPreparedCellForGlobalRow:willDisplay:] + 77
14 UIKit 0x01c0054b -[UITableView _updateVisibleCellsNow:isRecursive:] + 3034
15 UIKit 0x01c1aeb1 -[UITableView layoutSubviews] + 222
16 UIKit 0x01b907b1 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 608
17 libobjc.A.dylib 0x03368771 -[NSObject performSelector:withObject:] + 70
18 QuartzCore 0x009421cf -[CALayer layoutSublayers] + 152
19 QuartzCore 0x00936055 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 397
20 QuartzCore 0x00935eb0 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
21 QuartzCore 0x008941b6 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 284
22 QuartzCore 0x0089558a _ZN2CA11Transaction6commitEv + 392
23 QuartzCore 0x00895c56 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92
24 CoreFoundation 0x035ec18e __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
25 CoreFoundation 0x035ec0d0 __CFRunLoopDoObservers + 400
26 CoreFoundation 0x035e1b0a __CFRunLoopRun + 1226
27 CoreFoundation 0x035e137b CFRunLoopRunSpecific + 443
28 CoreFoundation 0x035e11ab CFRunLoopRunInMode + 123
29 GraphicsServices 0x04b3d2c1 GSEventRunModal + 192
30 GraphicsServices 0x04b3d0fe GSEventRun + 104
31 UIKit 0x01b049b6 UIApplicationMain + 1526
32 WebTableView 0x000dd6cd main + 141
33 libdyld.dylib 0x03e94ac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

I think valueForKeyPath: returning an array of objects. Try logging imageUrl and check what you are getting.
If you are confident that there would be only one url then you can try this -
NSString *imageUrl = [[tempDictionary valueForKeyPath:#"files.url_thumb"] lastObject];
Else try something like this -
valueForKey:#"files"] valueForKey:#"url_thumb]