Unable to get active_tasks listing due to json_encode error

http://10.3.2.46:8091/couchBase/_active_tasks

{"error":"json_encode","reason":"{bad_term,{view,<<\"_design/d3\">>}}"}

encode_rev(Bad) ->
throw({json_encode, {bad_term, Bad}}).

From couchdb logs:-
[couchdb:debug,2012-08-21T23:15:28.824,ns_1@10.3.2.46:<0.28864.18>:couch_log:debug:36]Minor error in HTTP request: {json_encode,{bad_term,

{view,<<"_design/d4">>}

}}
[couchdb:debug,2012-08-21T23:15:28.824,ns_1@10.3.2.46:<0.28864.18>:couch_log:debug:36]Stacktrace: [

{ejson,encode_rev,1}

,

{ejson,encode_proplist_rev,2}

,

{ejson,encode_array_rev,2}

,

{ejson,nif_encode,1}

,

{couch_httpd,send_json,4}

,

{couch_httpd,handle_request,6}

,

{menelaus_web,loop,3}

,

{mochiweb_http,headers,5}

]
[couchdb:info,2012-08-21T23:15:28.824,ns_1@10.3.2.46:<0.28864.18>:couch_log:info:39]10.32.10.40 - - GET /_active_tasks 500
[couchdb:debug,2012-08-21T23:15:28.825,ns_1@10.3.2.46:<0.28864.18>:couch_log:debug:36]httpd 500 error response:
{"error":"json_encode","reason":"{bad_term,{view,<<\"_design/d4\">>}}"}

The ns_server log files for this are attached here:-
http://www.couchbase.com/issues/browse/MB-6371

Attaching the cbcollect_info from the node having the issue.