Control connection to memcached disconnected

I downloaded and installed Version: 3.5.0-1335 Enterprise Edition (build-1335) on ubuntu 64 bit (couchbase-server-enterprise_3.5.0-1335-ubuntu12.04_amd64.deb).

I just initialized a new 1 node cluster and checked the logs and this is upcoming without me doing any load or so:

Control connection to memcached on 'ns_1@127.0.0.1' disconnected: {{badmatch,
{error,
closed}},
[{mc_client_binary,
cmd_vocal_recv,
5,
[

{file, "src/mc_client_binary.erl"}, {line, 156}]},
{mc_client_binary,
select_bucket,
2,
[{file, "src/mc_client_binary.erl"}

,

{line, 351}

]},
{ns_memcached,
ensure_bucket,
2,
[

{file, "src/ns_memcached.erl"}, {line, 1291}]},
{ns_memcached,
handle_info,
2,
[{file, "src/ns_memcached.erl"}

,

{line, 745}

]},
{gen_server,
handle_msg,
5,
[

{file, "gen_server.erl"}, {line, 604}]},
{ns_memcached,
init,1,
[{file, "src/ns_memcached.erl"}, {line, 174}]},
{gen_server,
init_it,
6,
[{file, "gen_server.erl"}

,

{line, 304}

]},
{proc_lib,
init_p_do_apply,
3,
[

{file, "proc_lib.erl"}

,

{line, 239}

]}]} (repeated 1 times)

Is that expected?