swift - NSURLSession returns data with bad access code -

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this function returning nil value data variable reason , can't understand why. have searched through many posts , can't seem find difference. had working request using different data if curl responses identical. makes far line states:

if let jsondata = responsestring?.datausingencoding(nsutf8stringencoding) {

and never goes if because responsestring value never set. changing implicit like

if let jsondata = responsestring!.datausingencoding(nsutf8stringencoding) {

returns bad access code.

func getdata(url: string, datatosend: string, username: string, password: string) {      somevar = [myobjecttype]()      let request = nsmutableurlrequest(url: nsurl(string: "%urltouse%")!)     request.httpmethod = "post"     let poststring = "%postdatahere%"      request.httpbody = poststring.datausingencoding(nsutf8stringencoding)     let task = nsurlsession.sharedsession().datataskwithrequest(request) {         data, response, error in          let responsestring = nsstring(data: data, encoding: nsutf8stringencoding)         dump(responsestring)         if let jsondata = responsestring?.datausingencoding(nsutf8stringencoding) {             if var jsondict = nsjsonserialization.jsonobjectwithdata(jsondata, options: nil, error: nil) as? nsdictionary {                 if var jsoninfo = jsondict["data"] as? nsdictionary {                     if var jsoninfosub = jsoninfo["data"] as? [nsdictionary] {                         report in jsoninfosub {                             self.somevar.append(myobjecttype(json: report))                         }                     }                 }             }         }     }      task.resume() }

all appreciated!

edit: additional information

this dump output other variables

dumping data returns bad access code

response: - <nshttpurlresponse: 0x7fbc5aca7120> { url: ____ } { status code: 200, headers {     connection = "keep-alive";     "content-length" = 428205;     "content-type" = "text/html; charset=iso-8859-1";     date = "fri, 29 may 2015 17:11:04 gmt";     "keep-alive" = "timeout=3, max=100";     p3p = "cp=\"noi deva taia our bus uni sta\"";     server = apache;     "set-cookie" = "_____; expires=sat, 28-may-2016 17:11:04 gmt; httponly, _____=76b17d064b58c412d078b5430ca9367e; httponly";     "x-powered-by" = plesklin;     "x-robots-tag" = "noindex, nofollow"; } } #0

error returns: - nil


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