iPhone Simulator chrashes in NSKeyedUnarchiver after setting base SDK

I started a project in xcode (3.2 on snow leopard) with base sdk 3.1.2. Now I changed this setting to 3.0 and it compiles without a warning. There are no problems running the app on the device, but the simulator crashes on launch every time with the following exception:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive (0x4e, 0x49, 0x42, 0x4开发者_StackOverflow中文版1, 0x72, 0x63, 0x68, 0x69)'

I do not use the NSKeyedUnarchiver, so why is the app trying to call it? And what archive is incomprehensible? I reset the simulator before building, so there are no userDefaults or anything else around.

Thanks for your help!

I solved the problem with this detailed stack trace:

#0  0x302ac924 in ___TERMINATING_DUE_TO_UNCAUGHT_EXCEPTION___  
#1  0x904a3509 in objc_exception_throw  
#2  0x3028e5fb in +[NSException raise:format:arguments:]  
#3  0x3028e55a in +[NSException raise:format:]  
#4  0x30513b77 in -[NSKeyedUnarchiver initForReadingWithData:]  
#5  0x30ab4b2a in -[UINib instantiateWithOptions:owner:loadingResourcesFromBundle:]  
#6  0x30ab6eb3 in -[NSBundle(NSBundleAdditions) loadNibNamed:owner:options:]  
#7  0x308f85f1 in -[UIApplication _loadMainNibFile]  
#8  0x30901a15 in -[UIApplication _runWithURL:sourceBundleID:]  
#9  0x308fef33 in -[UIApplication handleEvent:withNewEvent:]  
#10 0x308fad82 in -[UIApplication sendEvent:]  
#11 0x309013e1 in _UIApplicationHandleEvent  
#12 0x32046375 in PurpleEventCallback  
#13 0x30245560 in CFRunLoopRunSpecific  
#14 0x30244628 in CFRunLoopRunInMode  
#15 0x308f930d in -[UIApplication _run]  
#16 0x309021ee in UIApplicationMain  
#17 0x0000255c in main at main.m:14  

The app crashes while calling the mainNibFile. And I don't know why, but simply re-saving the MainWindow.xib solved the problem.

Try uninstalling your app completely from the simulator - it might be storing some data somewhere to do with the settings?

Do you have a stack trace from the debugger showing where the call to NSKeyedUnarchiver is coming from?

S

I had the very same kind of problem, after

1. sending my Xcode project on an FTP remote server (with FileZilla)
2. re-downloading
3. and launching it to check if the file passed well. The re-downloaded file had this problem.

I think the ftp makes problems with bundle files (such as .xcodeproj) because sometimes, .pages and .numbers files have problems too.

I solved the problem by

1. compressing my project (.zip)
2. uploading the .zip on the ftp.
3. re-downloading
4. unzipping it
5. when launched, no more problem !