[NSConcreteNotification objectForKey:]: unrecognized selector sent to instan

发送消息，代码如下

-(void)isCloseFile:(NSString *)zipName downWhichLoadName:(NSString *)downName{    NSDictionary *dictionary = [[NSDictionary dictionaryWithObjectsAndKeys:zipName,@"zipName",downName,@"downLoadWhichOne", nil] copy];         NSObject *object = [dictionary objectForKey:@"zipName"];      if (object != nil) {          NSLog(@"通过KEY找到的value是: %@",object);      }     NSObject *object2 = [dictionary objectForKey:@"downLoadWhichOne"];      if (object != nil) {          NSLog(@"通过KEY找到的value是: %@",object2);      }         NSNotificationCenter * center = [NSNotificationCenter defaultCenter];    [center postNotificationName:KPUNZIP object:self userInfo:dictionary];}

接收消息，代码如下

    NSDictionary *imformation = [[NSDictionary alloc] init];    imformation = (NSDictionary *)NSzipName;    NSLog(@"imformation:%@",imformation);    NSDictionary* text =[[NSDictionary alloc] init];    text = NSzipName.userInfo;    NSLog(@"text%@",text);        NSString * zipName = [text objectForKey:@"zipName"];    NSLog(@"zipName%@",zipName);    NSString *downLoadWhichOne = [text objectForKey:@"downLoadWhichOne"];    NSLog(@"downLoadWhichOne:%@",downLoadWhichOne);