Lightroom Classic CC: Failed to open: CRClient.dll Error 0xc0000020

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  • Problem
  • Updated 10 months ago
  • (Edited)
After an upgrade to Lightroom Classic CC, Lightroom failed to open. This error message was received: Lightroom classic CC|CRCclient.dll is either not designed to run on windows or contains an error.... Error status 0xc0000020.
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Fred Johnson

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Posted 11 months ago

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Bob Dunkley

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This happened to me also, so I’m glad I’m not alone.
Regards
BobD
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Fred Johnson

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My old Lightroom was also taken away. Anyone know how to get it back.
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Fred Johnson

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After deleting Lightroom classic then backing up my old Lightroom catalog files and reinstalling Lightroom classic everything is fine. I should have known that it's unwise to delete any programs before you see that the new version is working properly. Thank you all for your responses I hope the above suggestion help some of you get your Lightroom classic up and running looks like a wonderful program a great Improvement.
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Jens Stadsgaard

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Try to reinstall Lightroom Classic. 
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Bob Dunkley

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I installed LR CC2015 from the CC control panel, there is an option to do this. However, it seems to have none of the updates applied. I will continue to use this until Adobe sort out the problem that I had with LR Classic CC
BobD
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Pete Green, Customer Advocate

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Hi Fred and Bob,

Sorry about the error when starting Lightroom Classic -- Which version of Windows are you using?
Did either of you try uninstalling, and reinstalling Lightroom Classic?
Does a reboot of Windows make any difference? 

Regards
PG
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Helen Maw

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Same issue - cannot get lightroom classic to open - and I cannot work out in the new lightroom how to edit my pictures held on the hard drive
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Taylor Allcock

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I am getting a Crash report as soon as I try to open the program... Was working perfectly yesterday...
Windows 10 machine...
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Bob Dunkley

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Hi Pete, I’m using Win10. I updated LR from the CC control panel and when I clicked on the icon, I got the error message as in Fred’s post. I uninstalled LR Classic CC and tried again, same thing. I have now installed LR 2015CC and this is ok. A reboot of Windows did not have any effect.
Regards
BobD
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Jim Kucharek

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I have the exact same problem and neither a reinstall or restart fixes the problem.  I can run the updated Photoshop and every other program on the computer except Lightroom Classic.
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Marco Maiolino

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Me too!!!
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Jim Kucharek

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I have fixed my problem.  It turned out that Mcafee was somehow inferring with those dll files mentioned in the error messages.  I paused Mcafee, deleted Lightroom, and then reinstalled it.  It was up and working without any problems.  I went to Mcafee's exceptions page and entered all the dll files that were showing up in the error messages as trusted files so that the Mcafee software would ignore them.  It solved my problem.
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Pete Green, Customer Advocate

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Thanks for the update Jim! I wonder if this is the same case for the others experiencing this issue as well?
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Deb Martz

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No. Didn’t work for me. I now get installation failed (on reinstall. ).
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Bob Dunkley

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I’ll try this tonight and let you all know how I get on.
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Kate O'Brien

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Looks like this might work for me.  I have re-installed but forgot to screenshot the other error messages.  I had three errors.  Does anyone happen to have those error messages on hand so that I can enter them into Mcafee?  Thanks.
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Kate O'Brien

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You're a legend Jim!  I was pulling my hair out.  Thank-you. :) 
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Pete Green, Customer Advocate

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Is anybody still seeing this error message?

If so, have you tried Uninstalling Lightroom Classic, disabling McAfee, then Reinstalling Lightroom Classic from the CC Desktop application?

Any progress after that sequence of steps?

Let us know here.
Regards
Pete
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Annie Cash

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Same error message.  Same problem here.  I pause Mcaffee and uninstalled, then reinstalled Lightroom.  That fixed it for one day.  Then today I tried to start it up again and got the same error message.
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Pete Green, Customer Advocate

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Interesting, thanks for the update Annie, Does it start up again if you disable McAfee prior to launch?

Seems others are also adding the DLLs referenced in the error to McAfee's exception list, Does that help you at all?

Regards
Pete
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Annie Cash

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I finally discovered that the problem might be linked to another security filter called K9 that I had installed. I deleted K9, then temporarily disabled McAfee, reinstalled lightroom, and listed it as an exception to McAfee's virus scan. It works so far so good.
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Bob Dunkley

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Did you list Lightroom.exe as the exception, or the .dll files mentioned in the error message?
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Annie Cash

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Lightroom.exe. I did not reinstall K9.
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Pete Green, Customer Advocate

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Great to know it's working for you Annie, thanks for letting us know K9filter may have been involved. 

A few questions around K9-- Did you install K9 intentionally? Did you use it as a Parental Control on this computer? Do you still need it?

Regards
Pete
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Annie Cash

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We were using it intentionally as a filter for the kids against innappropriate sites. I was thinking of finding another filter or trying to install it again later.
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Annie Cash

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I hate to say this but my problem is back.  I got the error message when trying to start lightroom.  Now it wont let me delete it as it says I need administrator permission.  I am the administrator.  Not sure what to do.
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Steve

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I just started seeing this error. I have Lightroom Classic CC running on Windows 10 Version 1709. I have been starting Photoshop from Lightroom on this version of Windows for about a week. For example, earlier today I used Lightroom to edit several raw photos. I exported them as jpg from Photoshop. Tonight I copied two new raw photos to my harddrive using File Explorer. I edited the two photos and exported them as png from Lightroom Classic CC. I then decided I wanted to edit the raw photos in PSE. I to start Photoshop CC 2018 from Lightroom. I got the error message described in this thread. I restarted the PC and tried again. Same error. I have not tried the suggestion about McAfee. I will try it tomorrow. It doesn't make sense that McAfee would get in the way of this dll when it has allowed it previously. But then this error suddenly showing up doesn't make sense.
(Edited)
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Mary Hone

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I have had nothing but problems with LR and PS since the upgrade. First, it was PS that would not open. I would get error messages every time. I got onto Adobe help and they remotely took over my computer. Did the disable McAfee uninstall, reinstall all programs thing. This worked for a little while. Then, the only way I could access PS was directly from LR. Then I couldn't get on LR without the same error message shown above. Back to Adobe Help, who again remotely took over my computer. This person found that the Microsoft Visual C++ files were corrupt. After 90 minutes, everything was fixed again. Until the other day, when again I got the error message trying to open LR. Having watched the last remote take over, and repair I kinda knew what to do. So I fixed the Microsoft Visual C++ files...again, uninstalled and reinstalled LR and so far it's still working. Hopefully somebody, somewhere fixes this bug. 
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Frank Weitzman

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I'm having the same problem with the exact same error message.  I've uninstalled Lightroom twice, and reinstalled it.  Each time the program runs for a while.  I'm using McAffee paid version on windows 10 Creator's Edition.  Agree, it's a nuisance.  Hope this gets fixed soon
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Kevin Landis

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I had the same problem. I uninstalled and reinstalled several times. After each reinstall except the last one, Lightroom  Classic ran. After the last uninstall, I have not been able to reinstall, and get a Code 146 Error. I have uninstalled and reinstalled Adobe Creative Cloud Application, have tried to install Lightroom Classic from Adobe.com directly, and have tried the work around for Error Code 146 without success. I am now dead in the water, and have work to do. Maybe I should reinstall my credit card authorization and let Adobe figure out how to get paid.
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Akash Sharma, Digital Imaging Technical Support Consultant

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Hi Kevin,

Please refer this documentation https://helpx.adobe.com/lightroom/kb/bad-image-error-0xc0000020.html and let us know if that helps. 

Thanks, 
Akash Sharma