[Zope-CMF] Problems with CMF 1.3 and sitemap NFGnav 0.7.1

[Alexander Keller]

Hi,

with the following command I try to create a sitemap for a cmf-portal:

    <dtml-var "NFGnav.SiteMap(PARENTS, REQUEST, id(), initlevel=2,
BaseURL='/portal', 
    maxlevel=5, Meta_Types=['Portal Folder','Folder','CMF Site'])">

Everything works fine, but the PortalFolder-Icon is not displayed.
Instead
of the icon the error message "<bound method PortalFolder.getIcon of
<PortalFolder 
instance at 2099745d0>>" is posted. 
I have no idea where the error might be.

The following products are used:

    Zope 2.6.0 linux, CMF 1.3 and NFGnav 0.7.1


Thanks for your help!
Alexander Keller