Getting this error message "Lightroom encountered an error when reading from it's preview Cache and needs to quit. Lightroom will attempt to fix this problem the next time it launches." And then it immediately quits. I've tried uninstalling and then reinstalling because I own a copy of LR 5. I still get the same message. Please HELP!!
Preview cache file needs to be deleted in this case.
You need to go to the location where your Lightroom catalog is stored and delete the Previews.lrdata file (not .lrdat file)
By default, catalog is stored under Pictures\Lightroom folder