Compellent SC4020 Volume Snapshot showing a red circle

I have a question about an alert I am seeing for a snapshot. the snapshot in question is showing a red circle with a white x on it. I cannot figure out, nor find anything online to tell me why this is showing this alert. I am not sure how this should be configured and think that this could be the issue, but am not certain.

Any information as to why this snapshot is showing a red circle with a white x would be appreciated. I want to know why and try and resolve this before something breaks. I am not a SAN Admin, but am doing my best with this situation I was put in to learn.Red circle alert