Does backintime work for RHEL or CentOS 5.3?

I have installed (it seems successfully) backintime on a Red Hat Enterprise Linux 5.3 and I get the following error while launching backintime-gnome:
Traceback (most recent call last):
  File “/usr/share/backintime/gnome/app.py”, line 42, in ?
    import backintime
  File “/usr/share/backintime/common/backintime.py”, line 27, in ?
    import snapshots
  File “/usr/share/backintime/common/snapshots.py”, line 35, in ?
    import pluginmanager
  File “/usr/share/backintime/common/pluginmanager.py”, line 51
    class PluginManager():
                                      ^
SyntaxError: invalid syntax

Another user reported also the same problem on CentOS 5.3.

For information, python is in version 2.4.3