I have been having major issues with Lightroom recently. It took me 3hrs last night to export three sets of images because of this error.
The error comes at any point, during editing, during export, during import, on opening LR. It says that it will attempt to fix it when re-opening Lightroom but it doesn't work so I have to delete the preview cache file in explorer.
I have tried looking online for an answer to this but everyone just says delete the preview cache. This is fine but I get the error again shortly after and have to keep deleting it. I can't always delete it either, I sometimes have to go in via safe-mode to do it and obviously that takes a lot of time.
I really need a permanent fix to this issue. I would be tempted to upgrade to a later version but I'm worried that I may have the same problem.