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I've got an error I've seen on Chrome debug on a group cover picture with an old link image in CTREAM :
<div class="cStream-Attachment">
<img src="/images/cover/group/140/a2c51c66606c70d18fafa48cf8ec897a.jpg" />
</div>
It seems to be an old image I uploaded and then delete in our cover picture albums because the actual picture i uploaded after works fine.