android - FileNotFoundException when calling HttpURLConnection getInputStream -

i have app want update private server. code below should download new apk file server , write sdcard app can update from.

i'm getting filenotfoundexception. file exist on server.

any ideas why may happening?

thanks

public void updateapp(string version){         try {               version = version.trim();              string urlwithversion = "http://cfweb.yourofficeanywhere.co.uk/entryactivityv" + version + ".apk";                  url url = new url(urlwithversion);               httpurlconnection c = (httpurlconnection) url.openconnection();               c.setrequestmethod("get");               c.setdooutput(true);               c.connect();                log.e(tag, " httpurlconnection = connected");                string path = environment.getexternalstoragedirectory() +"/";               file file = new file(path);               file.mkdirs();               log.e(tag, "mkdirs()");               file outputfile = new file(file, "app.apk");               fileoutputstream fos = new fileoutputstream(outputfile);               log.e(tag, "fos");                inputstream = c.getinputstream();                log.e(tag, "c.getinputstream()");                byte[] buffer = new byte[1024];               int len1 = 0;               while ((len1 = is.read(buffer)) != -1) {                   log.e(tag, "update file size = " + len1);                   fos.write(buffer, 0, len1);               }               log.e(tag, "update file size = " + len1);               fos.close();               is.close();                 intent intent = new intent(intent.action_view);               intent.setdataandtype(uri.fromfile(new file(environment.getexternalstoragedirectory()  + "app.apk")), "application/vnd.android.package-archive");               intent.setflags(intent.flag_activity_new_task);               nfcscanneractivity.this.startactivity(intent);              } catch (exception e) {                log.e(tag, "update error = " + log.getstacktracestring(e));             }     }  //end of updateapp 

.

09-10 16:00:59.504: e/nfcscanneractivity(18814):  httpurlconnection = connected 09-10 16:00:59.504: e/nfcscanneractivity(18814): mkdirs() 09-10 16:00:59.504: e/nfcscanneractivity(18814): fos 09-10 16:00:59.644: e/mp-decision(2194): update arg 1  09-10 16:01:00.674: e/nfcscanneractivity(18814): update error = java.io.filenotfoundexception: http://cfweb.yourofficeanywhere.co.uk/entryactivityv33.apk 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ com.android.okhttp.internal.http.httpurlconnectionimpl.getinputstream(httpurlconnectionimpl.java:186) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ com.carefreegroup.rr3.nfcscanneractivity.updateapp(nfcscanneractivity.java:6353) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ com.carefreegroup.rr3.nfcscanneractivity$asyncupdateapp.doinbackground(nfcscanneractivity.java:6317) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ com.carefreegroup.rr3.nfcscanneractivity$asyncupdateapp.doinbackground(nfcscanneractivity.java:1) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ android.os.asynctask$2.call(asynctask.java:288) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ java.util.concurrent.futuretask.run(futuretask.java:237) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587) 09-10 16:01:00.674: e/nfcscanneractivity(18814):    @ java.lang.thread.run(thread.java:811)