2 Replies Latest reply on Feb 27, 2015 9:16 AM by DSalk

    Lightroom cache failure

    DSalk Level 1

      Lightroom will not start.  receive msg.,"Lighroom encountered an error when reading from preview cache  and needs to quit.  LR will attempt to fix this problem the next time it launches".  rebooting and relaunching  results in the same msg being displayed.  This problem started after two attempts to use "Export w/presets to create full size JPG."  Both attempts failed.  LR appeared to create JPGs as there was a progress bar showing an activity in progress but no files were burned.  I don't know if it's related, but one of the files I was editing displayed the photo but had a note at the top, "unexpected end of file" and would not permit any adjustments.


      Why is the forum the only place I can get help!?  This is really aggravating!  No offence to the forum, but Adobe should provide technical support at least by email or chat.  

        • 1. Re: Lightroom cache failure
          john beardsworth Adobe Community Professional & MVP

          To delete the preview cache, do this:

          1. Quit Lightroom.

          2. In your Operating System, locate your Lightroom catalog. Typically catalogs are in /Pictures/Lightroom on Mac and My Pictures\Lightroom on Windows.

          3. Find the folder whose name ends with "Previews.lrdata" and delete it. (note, you may also have a folder whose name ends with "Smart Previews.lrdata." You shouldn't need to delete that one.)


          Once the preview folder is deleted, restart Lightroom. You may see gray thumbnails in the grid for a few moments as Lightroom starts rebuilding your preview cache.

          • 2. Re: Lightroom cache failure
            DSalk Level 1

            Thank you for the reply.  Prior to receiving your reply I had tried a bunch of different attempts and I finally got one to work - sort of.  I don't remember exactly what steps I used but basically I found the catalog backup directory and opened one of the backup files.  This allowed LR to start with that catalog.  Unfortunately, the photos I had been working on (155 of them) when the problem occurred did not have the adjustments I had made. Additionally, LR still could not be started using the Desk Top short cut.  It kept giving me the same  "preview Cache error" msg.  I figured this was because LR was still trying to start using the default catalog.  I deleted the catalog that was in use when the problem occurred (I think it was named, "Lightroom 5 catalog.lr..).  Anyway, LR appears to be working now.  By the way, I discovered a directory named, "Corrupted catalog" and deleted the file (not the directory).  Again, thanks for your answer.  It will save me a lot of time if the problem occurs again.