Conticuously getting error "menelaus_web:loop:189]Server error during processing: ["web request failed""

We have a 3 node couchbase cluster where we are very frequently getting following error message in one of the of the nodes.

[ns_server:error,2017-03-20T18:32:14.802+05:30,ns_1@192.168.5.34:<0.6967.720>:menelaus_web:loop:189]Server error during processing: ["web request failed",
{path,"/pools/default/saslBucketsStreaming"},
{method,'GET'},
{type,error},
{what,{badmatch,{error,bad_module}}},
{trace,
[{menelaus_event,register_watcher,1,
[{file,"src/menelaus_event.erl"},
{line,58}]},
{menelaus_web,handle_streaming,3,
[{file,"src/menelaus_web.erl"},
{line,1713}]},
{request_throttler,do_request,3,
[{file,"src/request_throttler.erl"},
{line,59}]},
{menelaus_web,loop,2,
[{file,"src/menelaus_web.erl"},
{line,167}]},
{mochiweb_http,headers,5,
[{file,
"/home/couchbase/jenkins/workspace/watson-unix/couchdb/src/mochiweb/mochiweb_http.erl"},
{line,94}]},
{proc_lib,init_p_do_apply,3,
[

,

]}]}]

Please let us know when will this error observed?

Regards

Pratheej