Some Help on error: d.style is undefined

Hi,

I have this error using CKEditor:

d.style is undefined

Using

 CKEDITOR.replace(textAreaId, {
                          resize_enabled : false, ....

Can you help me ?
What I have to check ?

The textarea is added using Javascript to the DOM before call CKEDITOR.replace on it. Ckeditor work also on textarea added to DOM by Javascript ? is it legal for ckEditor ?

Thanks in advance
Stefano