Error

Hi,

in code:
    const accServiceID = '[email protected]/accessibilityService;1';
    const accServiceIF =
Components.interfaces.nsIAccessibilityService;
    const accService =
Components.classes[accServiceID].getService(accServiceIF);
    var   acc = accService.getAccessibleFor(window.content.document);
    var dom_window =
acc.QueryInterface(Components.interfaces.nsIAccessibleDocument);


I have next error:
[Exception... "Component returned failure code: 0x80570018
(NS_ERROR_XPC_BAD_IID) [nsIJSCID.getService]"  nsresult: "0x80570018
(NS_ERROR_XPC_BAD_IID)"  location: "JS frame ::
chrome://MeExtension/content/MeExtension.js :: InitHPFiller :: line
1199"  data: no]


I have FireFox version 3.0.3
In FF2 Ok
line 1199 - const accService =
Components.classes[accServiceID].getService(accServiceIF);


If i make:
    var accService = Service.getService();


accService.QueryInterface('Components.interfaces.nsIAccessibilityService');
error:
[Exception... "Could not convert JavaScript argument arg 0
[nsISupports.QueryInterface]"  nsresult: "0x80570009
(NS_ERROR_XPC_BAD_CONVERT_JS)"  location: "JS frame ::
chrome://MeExtension/content/MeExtension.js :: InitHPFiller :: line
1201"  data: no]


Please help!