[NSKeyedArchiver archivedDataWithRootObject] crash #423
Description
Thread 0 (crashed)
0 CoreFoundation!__exceptionPreprocess + 0x7c
Found by: given as instruction pointer in context
1 libobjc.A.dylib!objc_exception_throw + 0x34
Found by: previous frame's frame pointer
2 CoreFoundation!-[NSException raise] + 0x8
Found by: previous frame's frame pointer
3 Foundation!-[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 0xf8
Found by: previous frame's frame pointer
4 Foundation!-[NSObject(NSKeyValueCoding) valueForKey:] + 0x100
Found by: previous frame's frame pointer
5 MakeFriends!-[MJProperty valueForObject:] [MJProperty.m : 79 + 0x10]
Found by: previous frame's frame pointer
6 MakeFriends!__32-[NSObject(MJCoding) mj_encode:]_block_invoke [NSObject+MJCoding.m : 28 + 0xc]
Found by: previous frame's frame pointer
7 MakeFriends!+[NSObject(Property) mj_enumerateProperties:] [NSObject+MJProperty.m : 143 + 0xc]
Found by: previous frame's frame pointer
8 MakeFriends!-[NSObject(MJCoding) mj_encode:] [NSObject+MJCoding.m : 23 + 0x20]
Found by: previous frame's frame pointer
9 Foundation!_encodeObject + 0x498
Found by: previous frame's frame pointer
10 Foundation!-[NSKeyedArchiver _encodeArrayOfObjects:forKey:] + 0x1bc
Found by: previous frame's frame pointer
11 Foundation!_encodeObject + 0x498
Found by: previous frame's frame pointer
12 MakeFriends!__32-[NSObject(MJCoding) mj_encode:]_block_invoke [NSObject+MJCoding.m : 30 + 0x14]
Found by: previous frame's frame pointer
13 MakeFriends!+[NSObject(Property) mj_enumerateProperties:] [NSObject+MJProperty.m : 143 + 0xc]
Found by: previous frame's frame pointer
14 MakeFriends!-[NSObject(MJCoding) mj_encode:] [NSObject+MJCoding.m : 23 + 0x20]
Found by: previous frame's frame pointer
15 Foundation!_encodeObject + 0x498
Found by: previous frame's frame pointer
16 Foundation!+[NSKeyedArchiver archivedDataWithRootObject:] + 0xa8
Found by: previous frame's frame pointer
this is callstack
when I use NSData *descData = [NSKeyedArchiver archivedDataWithRootObject:item.desc];
to save my data.
I got this exception:
Exception Name: NSUnknownKeyException
Exception Reason: [ valueForUndefinedKey:]: this class is not key value coding-compliant for the key roomId.
but there is no roomId in my model.