vb.net - COMException was unhandled Visual Basic 2010 error -


i following error message when running code;

private sub submit_click(byval sender system.object, byval e system.eventargs) handles     submit.click         'determine text inpu'         dim ieapp shdocvw.internetexplorer         dim iedoc object         dim preurl string         dim localfilename string        dim errcode long        ieapp = createobject("internetexplorer.application")             ieapp                 .visible = false                 .navigate("http://mfreport.paho.org/barr/default.asp")                 while .busy : application.doevents() : loop             **while .readystate <> 4** : application.doevents() : loop                 .document.forms("rptform")                     .jobname.value = job.text                     .usrname.value = user.text                     .jobdate.value = dtp.text                     .submit()                     .action.click()                 end                while not cbool(instr(1, .document.url, "mfreport.paho.org/barr/default.asp"))                    application.doevents()                loop                while .busy : application.doevents() : loop             while .readystate <> 3 : application.doevents() : loop            end            iedoc = ieapp.document            = 0 iedoc.links.length - 1                   dim sfullimageurl string = "http://mfreport.paho.org/barr/jobreceived/" & iedoc.links(i).nameprop             dim slocalfilename string = "i:\sys_systems\support\test\" & iedoc.links(i).nameprop             dim mywebclient new webclient             call mywebclient.downloadfile(sfullimageurl, slocalfilename)         next     if errcode = 0         msgbox("download has completed")     else         msgbox("an error has occurred")     end if     ieapp = nothing end sub

when running in debbug following error message comexception unhandled rpc server unavailable. exception hresult: 0x800706ba


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