rebalance failed with error memcached exited with status 255

Install couchbase server 2.0.0r-265 on 4 nodes 10.1.1.170 to 10.1.1.173
Start with node 170.
Run memcachetest to load 200K items with minimum size 128 bytes per item to node 170.
After finish loading, add node 171 to node 170
Rebalance. OK.
Add 200K items more to cluster with minimum size 128 bytes per item
After finish loading, add node 172 to cluster 170
Rebalance. OK
Add 200K items more to cluster with minimum size 128 bytes per item
After finish loading, add node 173 to cluster 170
Rebalance. FAILED

Error:

Port server memcached on node 'ns_1@10.1.1.173' exited with status 255. Restarting. Messages: Extension support isn't implemented in this version of bucket_engine
Preloaded zu keys (with metadata)
The second phase of warmup took 5282 (us).

Rebalance exited with reason {badmatch,{error,closed,
[

{mc_client_binary,cmd_binary_vocal,6}

,

{mc_client_binary,get_vbucket,2}

,

{ns_memcached,handle_call,3}

,

{gen_server,handle_msg,5}

,

{proc_lib,init_p_do_apply,3}

]},
{gen_server,call,
[

{'ns_memcached-default','ns_1@10.1.1.173'}

,

{get_vbucket,108}

,
30000]}}