Error: Unable to handle type A

[betteray]

I dump the class by dsdump:

0x00000bee8e8 WAJID : NSObject /usr/lib/libobjc.A.dylib <NSCopying>
{
	+0x0008 AQ _stringRepresentation (0x8)
}
 @property (readonly) unsigned long statusType
 @property (readonly, ) unsigned long internalDomain
 @property (readonly, copy) NSString *stringRepresentation
 @property (readonly, copy) NSData *dataRepresentation
 @property (readonly, getter=isValid) BOOL valid

0x00000beec08 WADomainJID : WAJID
{
	+0x0010 Q _domain (0x8)
}
  // class methods
  0x00000299404 +(id)forUserEndpoint
  0x00000299444 +(id)forGroupEndpoint

  // instance methods
  0x000002992d8 -(id)initFromSubclass
  0x0000029931c -(id)initWithDomain:(id)arg1 
  0x00000299360 -(BOOL)isEqualToDomainJID:(id)arg1 
  0x000002993b0 -(unsigned long)internalDomain
  0x000002993bc -(id)dataRepresentation
  0x00000299400 -(BOOL)isValid

Also, the +0x0010 Q _domain (0x8) can't be handled.