error for category.xml

["Sophie Bouffies-Cloche (IPSL)" <Sophie.Bouffies-Cloche@xxxxxxxxxxxxxxx>]

Hi,

when I run genLas with category option, I got this error:

Internal: Unknown type/class combo: 
variable/LAS::Category::Filter::Dataset at ../xml/perl/LASServlet.pm 
line 2238.

This error occured when I used filter tag under a filter tag.  I looked 
the LASServlet.pm and found that the $class

expected should be LAS::Variable, not LAS::Category::Filter::Dataset.  
Is this a bug?

Part of my category file is like this:

<category name="2001">
   <filter action="apply-dataset" contains="large area dataset 2001">
        <filter action="apply-variable" contains="tcwv"/>
    </filter>
</category>


Note that I use las 6.1

Thanks

Sophie