svnsync sync failure

Dear SVN developers,

I met a svnsync interruption error during sync like:
 "Failed to get lock on destination repos, currently held by 'cn1dg04hpc:e7a198cf-eb76-be41-
 bdb7-336940434069'
...
svnsync: Couldn't get lock on destination repos after 10 attempts"

and the log info shows:
1)"Could not CHECKOUT resource /svn/Home/!svn/ver/364/200_Product_Management/270_B_Projects/270_1 Sundial_Inverter
prototype/Components/TDK 2.2KW DC-DC. [409, #0]
[client 140.231.201.98]"

2)"Unable to fetch the node revision id of the version resource within the revision. [409, #160013]
[client 140.231.201.98]"

I tried the normal way to del sync-lock to execute "svn propdel svn:sync-lock --revprop -r 0 <mirror repos>" but didn't work, the error info when tried to sync is:

"Transmitting file data ............svnsync: Error retrieving replay REPORT (160013): APR
does not understand this error code"

I use "svnadmin verify" the repository, all passed until the last reversion before interupted, I have no idea here,could you help to have a look? thanks very much.

---------------
Version: VisualSVN Server 2.1.4 (Subversion 1.6.13, Apache 2.2.13)
platform: windows XP

Jesse
Received on 2011-04-01 09:13:57 CEST