Error in saving data orbeon 4.0.0beta3 PE

> Hi,
> I find this error when saving a form containing a boolean checkbox input
> that drives the visibility of a text output control.
>
> exception while running action {throwable: "
> +----------------------------------------------------------------------------------------------------------------------+
> |An Error has Occurred
> |
> |----------------------------------------------------------------------------------------------------------------------|
> |Required item type of first argument of normalize-space() is xs:string;
> supplied value has item type xs:boolean
>
> I have seen something similar to this error was claimed to be solved with a
> further release of orbeon 4 released on the first days of February 2013
> (https://github.com/orbeon/orbeon-forms/issues/797)
>
> What should I do? download the new release of orbeon 4? I have searched for
> the file  named in the aforementioned issue (persistence-model.xml) but I
> have not found it yet.
>
> Thank you
>
>
>
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