"Lightroom encountered and error when reading from its preview cache and needs to quit"

LITEROOM ENCOUNTERED AND ERROR WHEN READING FROM ITS PREVIEW CACHE AND NEED QUIT

Hello guys. 
I work as a photo editor in Lightroom. I use the Lightroom catalog to send work to the client - photographers or other editors. We send to each other only exe-catalog .lrcat which content all the edits. 

Today I saw this error for the first time on my screen and I want to understand where it is coming from? I want to warn against this in the future.
Lightroom is asking me to fix this error during the next launch, it says the catalog is corrupted. So I also have a question, in this case, there is a rollback of those settings that have already been made in the catalog? I want not to miss any part of the job

Thanks

Thank you so much for this, have been having this issue too, not until I saw this and I tried it, it works fine for me now 

I am still having this problem dispite doing all the suggestions here. It still keeps closing down with this annoying message, I cant even edit a picture without this happening. It has become pointless having this software when you cannot use it. (Windows 10 user)

I've had the cache problem before and fixed it by deleting previews.irdata. This time it hasn't worked and LR will not open, the error appears immediately and I've also tried deleting the whole catalogue folder. As suggested in one of these posts I've renamed Preferences.agprefs to Preferences.agprefsOLD but this had no effect. I am closing LR and restarting my PC each time I try a fix. It also mentioned on here it could be a hard drive issue but I've run Windows error checking via the drives Properties, Tools and Check and no issues have been found. Any ideas?

I too was having this problem, and it was a recent issue.  Mine ended up with the same issue as "inshadow" where my cloud backup program was getting a temporary exclusive lock on the preview and causing this issue.  Going into crashplan and Google "Backup and and Sync" and excluding ".lrprev" files from it's coverage finally cured this issue (which the "preferences deletion" and the "LR preview deletion" had not).  It had got better when I added the exclusion for crashplan, but didn't go away completely until I added the exclusion to Google Backup and Sync.

For any others still having issues with this, I had to delete the actual folders that the previews are located in the previews themselves was not enough.

I encountered the same error, but due to a different cause, which required a different solution: My cloud backup program scans for file changes in real time and immediately uploads changed files to storage. The problem is that this will lock the files during scan and upload, which effectively blocks Lightroom from reading the file until the backup is done.

Solution: Exclude the folder "Lightroom Catalog Previews.lrdata" from the backup.

Security wise, to exclude the folder from backup isn't critical. After all, the content isn't essential as it will be rebuilt if lost.

I imported some small catalogs into 1 master catalog and am having this problem.

I have deleted ALL .LRDATA folders on my system.

Renamed the Preferences.agprefs to agprfes.old.

I ran a test on the hard drive - runs clean.

Windows 7 and LR 5.7.1

Any other suggestions?

Thanks

I have tried all of the solutions in this thread and I continue to get this error.  I can get Lightroom to open but while I am using it the error dialogue box pops up and Lightroom closes.