You get the message “Already in Library” because you have accidentally imported the photo DSC07712 twice, and they are in two different folders. You need to find this in the Lightroom Library Module using the Filter Bar. Please follow all four of these steps, in order.
- Click on All Photographs (its on the left under Catalog)
- Expand all stacks (Photo->Stacking->Expand All stacks)
- Turn off filters (Ctrl-L once or twice)
- Using the Filter Bar, search by file name for DSC07712
If you find two files this way, let us know and we can help you correct the problem.