Failed to restore backup items into bucket due to missing files

Install couchbase server 3.0.0-513 on 2 nodes cluster
10.3.121.17
10.6.2.139
Copy ep.so from build 3.0.0-403 into these 2 nodes cluster.
Do full backup data from default bucket with 1 replica.
/opt/couchbase/bin/cbbackup http://10.3.121.17:8091 /backup/backup-1
####################################### 200.0% (200000/estimated 100000 msgs)
bucket: default, msgs transferred...
: total | last | per sec
byte : 20937720 | 20937720 | 520355.9
done

Delete default bucket.
Create default bucket again.
Do cbrestore into default bucket. Got exception error

root@cen-2517 ~]# /opt/couchbase/bin/cbrestore /backup/backup-1/ http://10.3.121.17:8091 --bucket-source=default
Exception in thread w0:
Traceback (most recent call last):
File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner
self.run()
File "/usr/lib64/python2.6/threading.py", line 484, in run
self._target(*self.args, **self._kwargs)
File "/opt/couchbase/lib/python/pump.py", line 282, in run_worker
source_map, sink_map, self.ctl, curx).run()
File "/opt/couchbase/lib/python/pump.py", line 339, in run
rv_batch, batch = self.source.provide_batch()
File "/opt/couchbase/lib/python/pump_bfd.py", line 275, in provide_batch
"data-*.cbb")
File "/opt/couchbase/lib/python/pump_bfd.py", line 390, in list_files
for p in BFD.get_precessors(latest_dir):
File "/opt/couchbase/lib/python/pump_bfd.py", line 68, in get_precessors
json_file = open(os.path.join(parent_dir, "meta.json"), "r")
IOError: [Errno 2] No such file or directory: '/backup/backup-1/2014-03-26T230146Z/2014-03-26T230147Z-diff/bucket-default/node-10.6.2.139%3A8091/meta.json'

Traceback (most recent call last):
File "/opt/couchbase/lib/python/cbrestore", line 12, in <module>
pump_transfer.exit_handler(pump_transfer.Restore().main(sys.argv))
File "/opt/couchbase/lib/python/pump_transfer.py", line 86, in main
rv = pumpStation.run()
File "/opt/couchbase/lib/python/pump.py", line 126, in run
rv = self.transfer_bucket_msgs(source_bucket, source_map, sink_map)
File "/opt/couchbase/lib/python/pump.py", line 215, in transfer_bucket_msgs
source_map)
File "/opt/couchbase/lib/python/pump_bfd.py", line 360, in total_msgs
"data-*.cbb")
File "/opt/couchbase/lib/python/pump_bfd.py", line 390, in list_files
for p in BFD.get_precessors(latest_dir):
File "/opt/couchbase/lib/python/pump_bfd.py", line 68, in get_precessors
json_file = open(os.path.join(parent_dir, "meta.json"), "r")
IOError: [Errno 2] No such file or directory: '/backup/backup-1/2014-03-26T230146Z/2014-03-26T230147Z-diff/bucket-default/node-10.6.2.139%3A8091/meta.json'
[root@cen-2517 ~]#