Runtime error: Invalid Comment

I am downloading the profile picture of a list of Facebook friends and saving the files using network.download. The operation completes in the simulator and all the files correctly appear in the documents directory, but I also get a runtime error for each photo that I have never seen before that reads:
Runtime error
Invalid comment: **DOCUMENT LOCATION**
stack traceback:
[C]: ?
[C]: in function ‘?’
?: in function ‘ReadComment’
?: in function ‘SkipWhiteSpace’
?: in function <?:269>
(tail call): ?

Has anyone run into this before? I did a search of the forums and came up blank.

Am I downloading the files incorrectly in some way, or is there some information in the files that is causing this problem?

Thanks. [import]uid: 8666 topic_id: 18795 reply_id: 318795[/import]

you will have a problem if the photos are black and white and not 32 bits.

c. [import]uid: 24 topic_id: 18795 reply_id: 72476[/import]