-[__NSCFBoolean length]: unrecognized se?报错

报错代码:

 NSLog(@"title:%@",((DPArticles*)[data objectAtIndex:2]).title);

 [lOneView3.titleLabel setText:((DPArticles*)[data objectAtIndex:2]).title];

2014-08-25 10:50:08.801 traffic[1342:60b] title:0

2014-08-25 10:50:08.818 traffic[1342:60b] -[__NSCFBoolean length]: unrecognized selector sent to instance 0x3b5fde98

2014-08-25 10:50:08.828 traffic[1342:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFBoolean length]: unrecognized selector sent to instance 0x3b5fde98'

*** First throw call stack:

(0x30aaff4b 0x3ae3f6af 0x30ab38e7 0x30ab21cb 0x30a014d8 0x313d23d9 0x313d1ea9 0x33230cf9 0xc6c0d 0xc3eb7 0xc261d 0xc1ad7 0x14301f 0x30ab3504 0x309fddfb 0x31493e9b 0x30a7b183 0x30a7a653 0x30a78e47 0x309e3c27 0x309e3a0b 0x356c2283 0x33287049 0x545b5 0x2a530)

libc++abi.dylib: terminating with uncaught exception of type NSException