cannot cancel compaction from web console, possible browser request problem

User tried to cancel compaction and received an error with more detail in the log. See:
http://www.couchbase.com/forums/thread/compacting-operation-stuck-and-unable-cancel-2-0-beta

Also:
Client-side error-report for user "Administrator" on node 'ns_1@10.2.14.55':
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1
Browser client XHR failure encountered. (age: 1127) Diagnostic info:
s: {"url":"undefined","isLocal":false,"global":true,"type":"POST","contentType":"application/x-www-form-urlencoded","processData":true,"async":true,"accepts":

{"xml":"application/xml, text/xml","html":"text/html","text":"text/plain","json":"application/json, text/javascript","*":"*/*","script":"text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"}

,"contents":{"xml":{},"html":{},"json":{},"script":{}},"responseFields":

{"xml":"responseXML","text":"responseText"}

,"converters":

{"text html":true}

,"jsonp":"callback","timeout":30000,"cache":false,"dataTypes":["text"],"crossDomain":false,"hasContent":true}
xhrStatus: error,
xhrReadyState: 4,
errMsg: Object Not Found,
statusCode: 404,
responseText:
Not found.

Invalid post received: {mochiweb_request,#Port<0.874346>,'POST',"/undefined",

{1,1}

,
{16,
{"host",

{'Host',"localhost:8091"}

,
{"connection",

{'Connection',"keep-alive"}

,
{"authorization",

{'Authorization', "Basic QWRtaW5pc3RyYXRvcjpwYXNzd29yZA=="}

,
{"accept",

{'Accept',"*/*"}

,
nil,
{"accept-encoding",

{'Accept-Encoding',"gzip,deflate,sdch"}

,
{"accept-charset",

{'Accept-Charset', "ISO-8859-1,utf-8;q=0.7,*;q=0.3"}

,
nil,nil},
{"accept-language",

{'Accept-Language',"en-US,en;q=0.8"}

,
nil,nil}}},
{"cache-control",

{'Cache-Control',"no-cache"}

,
nil,nil}},
{"content-length",

{'Content-Length',"0"}

,
nil,
{"cookie",

{'Cookie', "randomKey=215904687; ri=1348083563697; auth=QWRtaW5pc3RyYXRvcjpwYXNzd29yZA%3D%3D"}

,
nil,nil}}},
{"origin",

{"Origin","http://localhost:8091"}

,
{"invalid-auth-response",

{"invalid-auth-response","on"}

,
nil,nil},
{"x-requested-with",

{"X-Requested-With","XMLHttpRequest"}

,
{"pragma",

{'Pragma',"no-cache"}

,
nil,
{"user-agent",

{'User-Agent', "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1"}

,
{"referer",

{'Referer', "http://localhost:8091/index.html"}

,
nil,nil},
nil}},
nil}}}}}