when working local, IOError: cannot read interlaced PNG files

Anyone know how to solve this?


Traceback (most recent call last):
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
GoogleAppEngi ne-default.bundle/Contents/Resources/google_appengine/
google/appengine/ext/ webapp/__init__.py", line 512, in __call__
    handler.post(*groups)
  File "/Users/user1/Documents/workspace/simcodi1/appengine/main.py",
line 75, in post
    item.thumbnail = db.Blob(images.resize(image, 100, 100))
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
GoogleAppEngi ne-default.bundle/Contents/Resources/google_appengine/
google/appengine/api/ images/__init__.py", line 625, in resize
    return image.execute_transforms(output_encoding=output_encoding)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
GoogleAppEngi ne-default.bundle/Contents/Resources/google_appengine/
google/appengine/api/ images.
.
.
r.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/
Resources/ google_appengine/google/appengine/api/images/
images_stub.py", line 378, in _Resize
    return image.resize((new_width, new_height), Image.ANTIALIAS)
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/site-packa ges/PIL/Image.py", line 1256, in resize
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/site-packa ges/PIL/ImageFile.py", line 155, in load
  File "/Library/Frameworks/Python.framework/Versions/2.5/lib/
python2.5/site-packa ges/PIL/PngImagePlugin.py", line 337, in
load_prepare
IOError: cannot read interlaced PNG files

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