I have had a problem in LR5 with a file of photos that I am getting the error message "There is an error working with this photo". This is only happening to some of the photos taken at a certain point in time during a trip we made. Other photos taken before or after I am able to work with and make adjustments without any problems. I have tried opening these photos in Explorer and thay are out of focus or a black screen comes up or it goes from out of focus to a black screen. If I use Picasa viewer I am able to view them without any problems but when I want to open them in Picasa they do not open. I think some of these files may be corrupted and ask if anyone has any ideas as to how to address this problem.
Thank you in advance for your help!
Most likely, the photos are corrupted, possibly because of bad camera card or bad card reader or bad USB cable/USB port/USB hub.
If you still have the photos on a camera card, you might try moving them to the computer again using different hardware. If the problem persists, they are probably not usable.