[Zope] Zope 2.5.1 import error on Red Hat 7.3

Hallo, we have import error with some zope plugins. This is a Traceback : Traceback (most recent call last): File "/home/Zope/lib/python/OFS/Application.py", line 531, in import_product product=__import__(pname, global_dict, global_dict, silly) File "/home/Zope/lib/python/Products/GUM/__init__.py", line 38, in ? import gum File "/home/Zope/lib/python/Products/GUM/gum.py", line 31, in ? from ZPublisher.HTTPRequest import html_quote ImportError: cannot import name html_quote ... Have you any idea? Thanks