我有问题。我在Objective C中制作了一个非常简单的应用程序，Xcode一直给我一个错误，上面写的是Thread 1：SIGABRT。这就是控制台所说的：
2013-12-27 20：01：24.375 RMF [1568：a0b] * 由于未捕获的异常'NSUnknownKeyException'而终止应用程序，原因：'[setValue：forUndefinedKey：]：此类是密钥Main_menu_rmf不符合密码值编码。'
*** First throw call stack:
(
0 CoreFoundation 0x0174e5e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x014bd8b6 objc_exception_throw + 44
2 CoreFoundation 0x017de6a1 -[NSException raise] + 17
3 Foundation 0x0117e9ee -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
4 Foundation 0x010eacfb _NSSetUsingKeyValueSetter + 88
5 Foundation 0x010ea253 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
6 Foundation 0x0114c70a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
7 UIKit 0x004cda15 -[UIRuntimeOutletConnection connect] + 106
8 libobjc.A.dylib 0x014cf7d2 -[NSObject performSelector:] + 62
9 CoreFoundation 0x01749b6a -[NSArray makeObjectsPerformSelector:] + 314
10 UIKit 0x004cc56e -[UINib instantiateWithOwner:options:] + 1417
11 UIKit 0x0033e605 -[UIViewController _loadViewFromNibNamed:bundle:] + 280
12 UIKit 0x0033edad -[UIViewController loadView] + 302
13 UIKit 0x0033f0ae -[UIViewController loadViewIfRequired] + 78
14 UIKit 0x0033f5b4 -[UIViewController view] + 35
15 UIKit 0x002679fd -[UIWindow addRootViewControllerViewIfPossible] + 66
16 UIKit 0x00267d97 -[UIWindow _setHidden:forced:] + 312
17 UIKit 0x0026802d -[UIWindow _orderFrontWithoutMakingKey] + 49
18 UIKit 0x0027289a -[UIWindow makeKeyAndVisible] + 65
19 UIKit 0x00225cd0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1851
20 UIKit 0x0022a3a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
21 UIKit 0x0023e87c -[UIApplication handleEvent:withNewEvent:] + 3447
22 UIKit 0x0023ede9 -[UIApplication sendEvent:] + 85
23 UIKit 0x0022c025 _UIApplicationHandleEvent + 736
24 GraphicsServices 0x036912f6 _PurpleEventCallback + 776
25 GraphicsServices 0x03690e01 PurpleEventCallback + 46
26 CoreFoundation 0x016c9d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
27 CoreFoundation 0x016c9a9b __CFRunLoopDoSource1 + 523
28 CoreFoundation 0x016f477c __CFRunLoopRun + 2156
29 CoreFoundation 0x016f3ac3 CFRunLoopRunSpecific + 467
30 CoreFoundation 0x016f38db CFRunLoopRunInMode + 123
31 UIKit 0x00229add -[UIApplication _run] + 840
32 UIKit 0x0022bd3b UIApplicationMain + 1225
33 RMF 0x00002c7d main + 141
34 libdyld.dylib 0x01d76725 start + 0
)
libc++abi.dylib: terminating with uncaught exception of type NSException