URL required in "preview comments" in COREBlog2 0.9b

I just became a member in CoreBlog list, hello to you
I have some problems in this product and I would like to launch it asap

Productsinstalled:  COREBlog2 0.9b installed  ( in Plone version: 2.1.2 &
Zope version: (Zope 2.8.6-final, python 2.3.5, linux2)

 I customize the cbcomment_form  page template, in order to hide the URL &
mail entries.
IIn my blog settings,  in Comments,trackbacks Details  section I have
unchecked "require email", required url", "Send a notification mail on new
comment"   and "Send a notification mail on new trackback " ;
I also customize cbadcomment python script and deleted in the entry #Try to
add comment  , the fields url and email.

I can  Add a new comments but  I cannot "preview" them . I get the error
"key error" value=URL.

I don't know where to change this, I have a look in the error log  and the
URL error is in "cbentry_view" form, but I don't have in that page template
any refereence to  'URL' field.

Can anyone help me???
Asen Quintana

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