Problem with JPEG output

Hello,
I have a little problem if I use optimize or progession with
JPEG.

I have a simple source:

import Image
im = Image.open("/tmp/thumbnail.jpg")
im.save('/tmp/thumbnail2.jpg', "JPEG",
optimize = 1)

which output this:

Suspension not allowed here
Traceback (most recent call last):
  File "test.py", line 5, in ?
    im.save('/tmp/thumbnail2.jpg', "JPEG",
optimize = 1)
  File
"/usr/lib/python2.4/site-packages/PIL/Image.py",
line 1331, in save
    save_handler(self, fp, filename)
  File
"/usr/lib/python2.4/site-packages/PIL/JpegImagePlugin.
py", line 409, in 
_save
    ImageFile._save(im, fp, [("jpeg",
(0,0)+im.size, 0, rawmode)])
  File
"/usr/lib/python2.4/site-packages/PIL/ImageFile.py&qu
ot;, line 493, in _save
    raise IOError("encoder error %d when writing image
file" % s)
IOError: encoder error -2 when writing image file

version: Imaging-1.1.6a1-20051211

Anyone knowns why this source output this exception and how
fix-it?

Btw: Sorry for my english
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