cbrestore error: design sink nodes missing

For build 2.0.0c-709-rel, when try to use couchbase://csvm187132:8091 as sink destination, error: design sink nodes missing appears

[root@csvm187132 common]# /opt/couchbase/bin/cbrestore /common/back_couch/nbackup couchbase://csvm187132:8091 -u Administrator -p Public123 -v -b endpoint -x try_xwm=0
2012-08-28 17:34:31,771: mt cbrestore...
2012-08-28 17:34:31,771: mt source : /common/back_couch/nbackup
2012-08-28 17:34:31,771: mt sink : couchbase://csvm187132:8091
2012-08-28 17:34:31,772: mt opts : {'username': '<xxx>', 'verbose': 1, 'dry_run': False, 'extra':

{'max_retry': 10.0, 'nmv_retry': 1.0, 'cbb_max_mb': 100000.0, 'try_xwm': 0.0, 'batch_max_bytes': 400000.0, 'report_full': 2000.0, 'batch_max_size': 1000.0, 'report': 5.0, 'recv_min_bytes': 4096.0}

, 'bucket_destination': None, 'add': False, 'threads': 4, 'key': None, 'password': '<xxx>', 'id': None, 'bucket_source': 'endpoint'}
2012-08-28 17:34:31,789: mt bucket: endpoint
2012-08-28 17:34:35,540: w0 source : /common/back_couch/nbackup(endpoint@10.90.187.78:8091)
2012-08-28 17:34:35,541: w0 sink : couchbase://csvm187132:8091(endpoint@10.90.187.78:8091)
2012-08-28 17:34:35,541: w0 : total | last | per sec
2012-08-28 17:34:35,541: w0 batch : 121 | 121 | 32.3
2012-08-28 17:34:35,541: w0 byte : 43872485 | 43872485 | 11703623.5
2012-08-28 17:34:35,541: w0 msg : 120000 | 120000 | 32011.7
################### 100.0% (120000/120000 msgs)
bucket: endpoint, msgs transferred...
: total | last | per sec
batch : 121 | 121 | 31.1
byte : 43872485 | 43872485 | 11265048.2
msg : 120000 | 120000 | 30812.2
error: design sink nodes missing