Hi all:

I'm getting a "There was an error in the callback" error when clicking on the check names button of the PeopleEditor in Sharepoint.

I didn't do anything fancy. All I did was just to create a PeopleEditor in the C# code and add it to a Panel, and let the aspx page renders it. The address book (the button next to the check names button) works. But everytime when I enter something in the PeopleEditor and click the check names button, I get that error.

I had a look at my aspx page, and I'm getting the feeling that I'm missing some sort of Javascript library. I have JQuery library included in my aspx page, but thats about it.

Does anyone know what might be wrong?

[UPDATE] The PeopleEditor is appended to a panel, which is displayed when the value of a dropdown list changes.

Thanks.