[jQuery] "No element found" when firing $.post()

[Thomas]

Hello together,

just a short question: by firing a request via POST to the server side
Firefox shows an "No element found" (in German "Kein Element
gefunden") in its Error console (Firebug displays nothing). Example:

$.post("/Portal/ReorderPortlets", { portlets: $("#portal").sortable
("toArray") });

I am a bit confused, could anyone bring some light into this?

Thanks :)

Thomas