I have window 8.1 and lightroom 5.7. I keep on getting messages of 'Lightroom encountered error while reading from it's preview cache and need to quit'. Then it closes and stops from opening. Please help. Urgent need to use it asap!Li
Often fixed by moving or renaming the Previews folder (*.lrdata), and re-starting Lightroom.
The previews will be automatically re-built, maybe taking some time if you have many images.
Have a read of-
Retrieving data ...