Zope-2.8 b1 does not start with silva + filesystemsite installed

When starting a Zope-2.8b1 instance with Silva installed I get the 
following traceback

/ZP/zope28instance/bin/zopectl fg
/ZP/zope28instance/bin/runzope -X debug-mode=on
2005-05-04 13:49:56 INFO ZServer HTTP server started at Wed May  4 
13:49:56 2005        Hostname: siemi
         Port: 9480
2005-05-04 13:49:56 INFO Zope Set effective user to "zope26"
2005-05-04 13:49:57 WARNING OFS.Application Duplicate Product name
After loading Product 'Annotations' from '/ZP/zope28instance/Products',
I skipped the one in '/usr/local/ZopePark/zope28instance/Products'.

2005-05-04 13:49:57 ERROR Zope Could not import Products.FileSystemSite
Traceback (most recent call last):
   File "/ZP/zope280base/lib/python/OFS/Application.py", line 675, in 
import_product
     product=__import__(pname, global_dict, global_dict, silly)
   File "/ZP/zope28instance/Products/FileSystemSite/__init__.py", line 
9, in ?
     import FSPageTemplate
   File "/ZP/zope28instance/Products/FileSystemSite/FSPageTemplate.py", 
line 221, in ?
     d['source.xml'] = d['source.html'] = Src()
TypeError: object does not support item assignment
Traceback (most recent call last):
   File "/ZP/zope280base/lib/python/Zope2/Startup/run.py", line 56, in ?
     run()
   File "/ZP/zope280base/lib/python/Zope2/Startup/run.py", line 21, in run
     starter.prepare()
   File "/ZP/zope280base/lib/python/Zope2/Startup/__init__.py", line 98, 
in prepare
     self.startZope()
   File "/ZP/zope280base/lib/python/Zope2/Startup/__init__.py", line 
256, in startZope
     Zope2.startup()
   File "/ZP/zope280base/lib/python/Zope2/__init__.py", line 47, in startup
     _startup()
   File "/ZP/zope280base/lib/python/Zope2/App/startup.py", line 44, in 
startup
     OFS.Application.import_products()
   File "/ZP/zope280base/lib/python/OFS/Application.py", line 652, in 
import_products
     import_product(product_dir, product_name, raise_exc=debug_mode)
   File "/ZP/zope280base/lib/python/OFS/Application.py", line 675, in 
import_product
     product=__import__(pname, global_dict, global_dict, silly)
   File "/ZP/zope28instance/Products/FileSystemSite/__init__.py", line 
9, in ?
     import FSPageTemplate
   File "/ZP/zope28instance/Products/FileSystemSite/FSPageTemplate.py", 
line 221, in ?
     d['source.xml'] = d['source.html'] = Src()
TypeError: object does not support item assignment

-- 
Mit freundlichen Grüßen                                Joachim Schmitz
......................................................................
AixtraWare eK ..Joachim Schmitz ..www.aixtraware.de ..t: +49-2464-8851
Hüsgenstr. 33a .....d-52457 Aldenhoven .............f: +49-2464-905163