`Screenshot image url` not working.

[AdminDev826]

mp4_encoding.url
=> "http://s3.amazonaws.com/my_panda_bucket/4567.mp4"

mp4_encoding.screenshots[1]
=> "http://s3.amazonaws.com/my_panda_bucket/4567_1.jpg"

Video url works fine but image url not working.
Getting an error xml code for the Image url

<Error>
<Code>NoSuchKey</Code>
<Message>The specified key does not exist.</Message>
<Key>4567_1.jpg</Key>....
</Error>