SchoolTool not start

After solved my previous problem, the Schooltool not started anymore. So, I decided to reinstall everything again. Before I had installed with tarball. Now:

Installed Ubuntu 10.04 in my server in the cloud.

Add both PPA (ppa:schooltool-owners/dev and ppa:schooltool-owners/ppa)

# apt-get update
#apt-get install schooltool

Great, everything installed. Success. But not started.

In /etc/schooltool/standard/paste.ini , I changed the local address for DNS name in the server cloud.

Restarted or started Schooltool and did not work. (http://servercloud:7080)

Below is the log:

File "/usr/lib/pymodules/python2.6/paste/deploy/loadwsgi.py", line 431, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/usr/lib/pymodules/python2.6/paste/deploy/loadwsgi.py", line 361, in get_context
    global_conf=global_conf)
  File "/usr/lib/pymodules/python2.6/paste/deploy/loadwsgi.py", line 248, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/pymodules/python2.6/paste/deploy/loadwsgi.py", line 285, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/pymodules/python2.6/paste/deploy/loadwsgi.py", line 561, in get_context
    object_type, name=name)
  File "/usr/lib/pymodules/python2.6/paste/deploy/loadwsgi.py", line 581, in find_egg_entry_point
    pkg_resources.require(self.spec)
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 648, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 546, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: distribute

How to fix this problem?? Can help me?
Thanks