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

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  • Updated 11 months ago
I am on the Creative Cloud and I did the update tonight as instructed by the app.  Now I get the error message "LR encountered an error when reading from its preview cache and needs to quit".  The application won't open.
I'm running OS 10.9.5 on a Mac.  The program was running perfectly before I did the update.  I have shut down the computer, restarted.  I have uninstalled and reinstalled the program.
Still having the problem.  Can someone help?
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Dailyn Matthews

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  • frustrated.

Posted 11 months ago

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John Carlomano

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I am running LR CC Classic on a Windows 10 system and have encountered the same problem. I have not found a solution yet either.
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Johan Elzenga, Champion

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The solution is probably simple; your previews cache is corrupt. Open your catalog folder and move the 'Catalog name Previews.lrdata' out of this folder. You can trash it, or place it somewhere else for the time being.

Now start Lightroom. Lightroom should start normally, but at first you won't see any previews, just empty 'slide mounts'. That is because Lightroom will have to rebuild that cache. You will see the previews appear one by one. Each time you scroll down in the grid, the same thing will happen. The previews will need to be rebuilt before they show, so it takes about 1 second per preview.

When everything works as expected you can delete the old previews.
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Dailyn Matthews

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I am trying this but getting this dialog box now:
The last time you opened LR, it unexpectedly quit while reopening windows.  Do you want to try to reopen its windows again?  If you choose not to reopen windows, you may have to open and position windows yourself."

What does this mean?  Do I push "don't reopen" or "reopen"?
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Victoria Bampton - Lightroom Queen, Champion

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When you say you updated the app, what version are you running now? Lightroom CC 2015.6.1/Lightroom 6.6.1 were the last versions supported on Mac OS 10.9, so it may be OS update time too.
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Dailyn Matthews

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Found it.  Downloading now.
Once I've downloaded it, how does it appear in the cloud?

Thanks for helping me, Victoria.  I have a couple yahoos on another forum acting like they are the LR Gods giving me all kinds of conflicting information.  They're saying it's a hardware issue but then I found another link from THE SAME GUY saying it's software compatibility!!
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Victoria Bampton - Lightroom Queen, Champion

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What do you mean by "how does it appear in the cloud?" You mean the Creative Cloud app? It'll probably say it needs an update, but until you update your OS, don't do that.
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Dailyn Matthews

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So on my Mac, there is an icon on the top right of my desktop - Adobe logo.  The pull down menu gives you the option to open the application there - i.e. through "the cloud".  Since this is where the problem started, I am afraid to launch/open through there, but is this where that newly installed version + update appears?
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Dailyn Matthews

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It's working!  I had to uninstall from the cloud and reinstall LR 6 onto my computer (outside the cloud) with the update to 6.6.1
That is the highest I can go with my OS 10.9.5
Thank you for your assistance!
My nausea has subsided.  Time to enjoy the holiday.  
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Victoria Bampton - Lightroom Queen, Champion

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I'm so pleased to hear it Dailyn!
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Dailyn Matthews

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