[Tilecache] cache expire problem

[DFE]

Hi all,
I received the following error:

An error occurred: 'module' object has no attribute 'Utils'
  File "/var/www/tlc/TileCache/Service.py", line 263, in modPythonHandler
    apacheReq.headers_out['Expires'] =
email.Utils.formatdate(time.time() + service.cache.expire, False,
True)



when I try to put the "expire" property to the [cache]

[cache]
type=Disk
base=/var/www/tlc_cache
expire=180

Thanks,
Domenico.
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