Errors when hiding sections

> We encounter 2 kind of errors on 4.0 Beta3 PE on tomat 7 with exist database
>
> 1. with a very simple form. a radiobutton and a section.
>  the section visibility is controlled with this statement ($control-3 =
> 'two').
> The function works. Clicking on the 2nd radiobutton shows the section.
> Clicking on another hides the section and shows this error
>
> Undeclared variable in a standalone expression: $fb-can-do-classes in
> oxf:/xbl/orbeon/section/section.xbl line 72
> (org.orbeon.saxon.trans.XPathException)
> Undeclared variable in a standalone expression: $open in
> oxf:/xbl/orbeon/section/section.xbl line 112
> (org.orbeon.saxon.trans.XPathException)
>
>
>
> 2. the second test form is larger, with mandatory fields and lot of hiding
> of sections and controls. The hiding and showing is done with the same
> statement as with the first form.
> When the user saves the form this error occurs:
>
> Required item type of first argument of normalize-space() is xs:string;
> supplied value has item type xs:date in
> oxf:/apps/fr/includes/persistence/persistence-model.xml line 306
> (org.orbeon.saxon.trans.XPathException)
>
>
>
>
>
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