[Zope] "No module named Splitter" on importing an 2.4.3 folder into 2.5.1b1

[Hamish Lawson]

I've exported a folder from a Zope 2.4.3 server, but when I try to 
import it into a Zope 2.5.1b1 server I get the error below about no 
Splitter module; both Zope servers are running on the same Solaris 8 
machine.

Error Type: ImportError
Error Value: No module named Splitter

Traceback (innermost last):
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZPublisher/Publish.py, 
line 150, in publish_module
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZPublisher/Publish.py, 
line 114, in publish
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/Zope/__init__.py, 
line 159, in zpublisher_exception_hook
     (Object: Zope)
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZPublisher/Publish.py, 
line 98, in publish
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZPublisher/mapply.py, 
line 88, in mapply
     (Object: manage_importObject)
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZPublisher/Publish.py, 
line 39, in call_object
     (Object: manage_importObject)
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/OFS/ObjectManager.py, 
line 521, in manage_importObject
     (Object: Zope)
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/OFS/ObjectManager.py, 
line 537, in _importObjectFromFile
     (Object: Zope)
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZODB/ExportImport.py, 
line 79, in importFile
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZODB/Transaction.py, 
line 234, in commit
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZODB/Connection.py, 
line 235, in commit
   File 
/spare/hamish/Zope-2.5.1b1-solaris-2.6-sparc/lib/python/ZODB/ExportImport.py, 
line 148, in _importDuringCommit
ImportError: (see above)


Anyone got any ideas?

Thanks,
Hamish Lawson