Xmarks同步书签，本地记录文件报这样的错误，是什么原因呢？

使用自建FTP服务器，
A机的fiefox能上传下载书签，木有问题
B机一去sync，就会出现这样的问题
还未找到C机尝试。。。。

[2014-04-22 00:53:19] Begin AcceptNodes async
[2014-04-22 00:53:19] Modifying locationmap for 3 from [null, null] to ["ROOT", (void 0)]
[2014-04-22 00:53:19] Modifying locationmap for 5 from [null, null] to ["ROOT", (void 0)]
[2014-04-22 00:53:19] GetItemIdForGUID unable to get itemId for nid=hu9wce2i-0
[2014-04-22 00:57:27] Host browser is FF22+, use private DB, use async favicon and livemarks functions
[2014-04-22 00:57:27] Host browser is FF22+, use private DB, use async favicon and livemarks functions
[2014-04-22 00:57:30] Host browser is FF22+, use private DB, use async favicon and livemarks functions
[2014-04-22 00:58:30] ------ Xmarks/4.2.1 (/Places) starting sync with ftp://xxx.2288.org:15005 ------
[2014-04-22 00:58:30] Host browser is FF22+, use private DB, use async favicon and livemarks functions
[2014-04-22 00:58:30] Failed to load baseline.
[2014-04-22 00:58:30] Returned error: Synchronization error(4)
[2014-04-22 00:58:30] Will retry at Tue Apr 22 2014 01:13:35 GMT+0800
[2014-04-22 01:13:16] ------ Xmarks/4.2.1 (/Places) starting sync with ftp://xxx.2288.org:15005 ------
[2014-04-22 01:13:16] Host browser is FF22+, use private DB, use async favicon and livemarks functions
[2014-04-22 01:13:16] Failed to load baseline.
[2014-04-22 01:13:16] Returned error: Synchronization error(4)
[2014-04-22 01:13:16] Will retry at Tue Apr 22 2014 03:13:28 GMT+0800

没用过自定义服务器，最新版本官方是4.2.5
http://download.xmarks.com/download
先试试最新版本看看。

折腾了一个月，我再做了一个FTP服务器，用了filezilla再另外建了一个ftp进程
结果A,B两台机发生了这样微妙的关系
1、A机上传覆盖一个状态，A机不断在修改，同步，没有问题
2、如果接着B机去同步，B机会提示sync还是下载覆盖，无论选择哪个，B机会一直在做同步，也不提示失败，书签也没变化。
3、关掉B机，然后让A机去同步，也会提示sync还是下载覆盖（B机已经把服务器上的版本动手了），无论选择哪个，A机会一直在做同步，也不提示失败，书签也没变化。
4、要么A，要么B单独上传覆盖，然后各自自个儿用就没事，交叉同步，书签一定坏
5、排除了局域网内防火墙的搞鬼的因素。是不是逼我们一定要用xmarks的服务？


是否还有其它类似的扩展？

书签同步的话，还可以试试eversync
https://addons.mozilla.org/en-US/firefox/addon/fvd-synchronizer/?src=search