I'm having the same problem.
Last week LR was working fine. Yesterday I come home from vacation, and LR won't launch, and displays this error before shutting down. I found this post and deleted the preview data and it launched. I did my import and development like normal and close the software. Next time I go to open it, same error.
It's to the point that I have to delete the previews data EVERY SINGLE TIME prior to opening the software. This is ridiculous. Is there a long term fix available?
Thanks,
Ed