Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 4 beyond bounds [0 .. 2]'

[wendysun0315]

2016-09-23 14:53:47.615 KFEpubKit iOS[1736:75640] will open epub
2016-09-23 14:53:47.877 KFEpubKit iOS[1736:75640] opened: analytics-book-13aug2016
2016-09-23 14:53:47.894 KFEpubKit iOS[1736:75640] * Terminating app due to uncaught exception 'NSRangeException', reason: '* -[**NSArrayM objectAtIndex:]: index 4 beyond bounds [0 .. 2]'
* First throw call stack:
(
0 CoreFoundation 0x000000010582cd85 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001052a0deb objc_exception_throw + 48
2 CoreFoundation 0x000000010570a804 -[__NSArrayM objectAtIndex:] + 212
3 KFEpubKit iOS 0x0000000102fa0204 -[KFViewController updateContentForSpineIndex:] + 164
4 KFEpubKit iOS 0x0000000102fa057a -[KFViewController epubController:didOpenEpub:] + 282
5 KFEpubKit iOS 0x0000000102fa1b95 -[KFEpubController epubExtractorDidFinishExtracting:] + 2949
6 KFEpubKit iOS 0x0000000102fa2bf7 -[KFEpubExtractor doneExtracting:] + 135
7 Foundation 0x00000001047bf2c9 __NSFireDelayedPerform + 402
8 CoreFoundation 0x0000000105786074 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 20
9 CoreFoundation 0x0000000105785c21 __CFRunLoopDoTimer + 1089
10 CoreFoundation 0x0000000105747b11 __CFRunLoopRun + 1937
11 CoreFoundation 0x00000001057470f8 CFRunLoopRunSpecific + 488
12 GraphicsServices 0x0000000107141ad2 GSEventRunModal + 161
13 UIKit 0x00000001031eaf09 UIApplicationMain + 171
14 KFEpubKit iOS 0x0000000102f9f4ef main + 111
15 libdyld.dylib 0x0000000105fab92d start + 1
16 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

[ricobeck]

Could you give some further details what you did? As it is a runtime error I need some further information.