似乎是NSData的问题，用排除法分析了一下

NSString *urlStr = [NSString stringWithFormat:@"%@/config/AppConfig.json",*******];    [NetRequestHelp createNetRequestWithURL:urlStr parameters:nil requestType:CYRequestMethodTypeGET responseSeializerType:CYResponseSeializerTypeData completionHandle:^(BOOL success, id responseObject, NSString *message) {        if(success)            {            NSDictionary *configDic = [JSONHelp JSONObjectWithData:responseObject];//当此处的responseObject为空的时候，就会报上面错误            [configDic writeToFile:APP_CONFIG atomically:YES];                         } else {                         }     }];

 此时在if(success){ }里面再加一层判断即可避免报上述错误

if(responseObject == null) {             NSDictionary *configDic = [JSONHelp JSONObjectWithData:responseObject];//当此处的responseObject为空的时候，就会报上面错误            [configDic writeToFile:APP_CONFIG atomically:YES];                         } else {                         }