I'm having a problem with my app and CoreData. I am using CoreData to save the user information and I have spent a long time searching how to use core data correctly. I have found and I learned how to use, but the problem have started when I deleted the app from the IOS simulator. When I did that the app freeze and the follow error appears in the console:
2015-06-20 23:20:23.141 AppName[1767:218797] *** Terminating
app due to uncaught exception 'NSRangeException', reason: '*** -
[__NSArrayI objectAtIndex:]: index 0 beyond bounds for empty array'
*** First throw call stack:
(
0 CoreFoundation 0x000000010a70ec65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010c279bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010a60517e -[__NSArrayI objectAtIndex:] + 190
3 YoutubeBillionaire 0x000000010a103df2 _TFC18YoutubeBillionaire14ViewController11viewDidLoadfS0_FT_T_ + 2562
4 YoutubeBillionaire 0x000000010a1059f2 _TToFC18YoutubeBillionaire14ViewController11viewDidLoadfS0_FT_T_ + 34
5 UIKit 0x000000010b0de210 -[UIViewController loadViewIfRequired] + 738
6 UIKit 0x000000010b0de40e -[UIViewController view] + 27
7 UIKit 0x000000010aff92c9 -[UIWindow addRootViewControllerViewIfPossible] + 58
8 UIKit 0x000000010aff968f -[UIWindow _setHidden:forced:] + 247
9 UIKit 0x000000010b005e21 -[UIWindow makeKeyAndVisible] + 42
10 UIKit 0x000000010afa9457 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2732
11 UIKit 0x000000010afac1de -[UIApplication _runWithMainScene:transitionContext:completion:] + 1349
12 UIKit 0x000000010afab0d5 -[UIApplication workspaceDidEndTransaction:] + 179
13 FrontBoardServices 0x000000010dd895e5 __31-[FBSSerialQueue performAsync:]_block_invoke_2 + 21
14 CoreFoundation 0x000000010a64241c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
15 CoreFoundation 0x000000010a638165 __CFRunLoopDoBlocks + 341
16 CoreFoundation 0x000000010a637f25 __CFRunLoopRun + 2389
17 CoreFoundation 0x000000010a637366 CFRunLoopRunSpecific + 470
18 UIKit 0x000000010afaab42 -[UIApplication _run] + 413
19 UIKit 0x000000010afad900 UIApplicationMain + 1282
20 YoutubeBillionaire 0x000000010a1192e7 main + 135
21 libdyld.dylib 0x000000010c9d1145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
Thanks everyone.
The error is pretty self-explanatory; You're trying to access a value in an empty array. Your CoreData request must not be returning any results. Make sure you check for an empty array before trying to access elements in it. If you delete your app from your device/the simulator it deletes all the data in CoreData, thus any request would return an empty array.