Python problems

Compiling /usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/formgen.py ...
  File "/usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/formgen.py", line 12
    @dispatch.generic()
    ^
SyntaxError: invalid syntax

Compiling /usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/sqlformgen.py ...
  File "/usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/sqlformgen.py", line 11
    @makeform.when('isinstance(obj, SQLObject) or (isinstance(obj, type) and issubclass(obj, SQLObject))')
    ^
SyntaxError: invalid syntax

dpkg: error processing rdiff-backup (--configure):
 subprocess post-installation script returned error exit status 1
Setting up trac (0.8.1-3sarge4) ...
Compiling /usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/formgen.py ...
  File "/usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/formgen.py", line 12
    @dispatch.generic()
    ^
SyntaxError: invalid syntax

Compiling /usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/sqlformgen.py ...
  File "/usr/lib/python2.3/site-packages/FormEncode-0.4-py2.3.egg/formencode/sqlformgen.py", line 11
    @makeform.when('isinstance(obj, SQLObject) or (isinstance(obj, type) and issubclass(obj, SQLObject))')
    ^
SyntaxError: invalid syntax

dpkg: error processing trac (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 rdiff-backup
 trac
E: Sub-process /usr/bin/dpkg returned an error code (1)