NullPointerException with Directorygenerator

[[EMAIL PROTECTED]]

Just upgraded from 2.1.5.1 to 2.1.7, and now I'm having problems with 
DirectoryGenerator. Scanning a subdirectory using

   <map:match pattern="">
      <map:generate type="directory" src="AnySubdirectory">
      <map:parameter name="depth" value="1"/>
      </map:generate>
      <map:serialize type="xml"/>
   </map:match>
works perfectly. But I'm getting NullPointerException when trying to 
generate the actual directory using

      <map:generate type="directory" src=".">
I have no experience evaluating the error messages. So I put it on a 
server hoping that someone else knows how to read it:
<http://home.arcor.de/plsdontreply/NullPointerException.html>

Does somebody have a solution?
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