[jQuery] bug caught when retrieving data

[jQuery] bug caught when retrieving data

if encountered a weird bug it spilled out this error message...
<span class="objectBox objectBox-errorMessage hasBreakSwitch opened">[Exception...
"Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE)
[nsIXMLHttpRequest.open]" nsresult: "0x80070057
(NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: javascript:
eval(__firebugTemp__); :: anonymous :: line 1" data: no]
this is where the error seems to occur, I can't seem to get a better detail on what.
  showEtapes = function(){
    $("div#cptEtapes").show();
    $.post("request.aspx",{show:"cpt1"},function(html){
    //[Exception... "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIXMLHttpRequest.open]" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: javascript: eval(__firebugTemp__); :: anonymous :: line 1" data: no]
     $("div#cptEtapes").append(html);
    });
  }
does anibody knows what this error could be?
greets,
Michel
</span>
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