Lightroom won't open due to a code execution system error

Forum|Forum|25 days ago
June 7, 2026
1 reply
31 views

I have the latest version of Lightroom Classic on my Windows PC. It was working fine last night but today it won’t open. It produced 3 separate error messages saying that the code execution cannot proceed because ahclient.dll (and two other files it also lists) was not found. It says reinstalling the program may fix this problem.

Has anyone else has this issue please and why is it happening?

Correct answer F. McLion

Posting a screenshot could be helpful. Also, please post the system information found in the help menu as this gives us all the information about your LrC, OS and GPU driver versions.

I’d try to remove and reinstall LrC - Your data is safe while you do this.

F. McLion

Correct answer

Community Expert

Posting a screenshot could be helpful. Also, please post the system information found in the help menu as this gives us all the information about your LrC, OS and GPU driver versions.

I’d try to remove and reinstall LrC - Your data is safe while you do this.

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K

kathiemaytAuthor

Inspiring

Thanks. I didn’t take snapshots, sorry. Did a lot of research, including about uninstalling and reinstalling, which is what I ended up doing. However, was concerned that this happened and had never seen it before in all the years I’d been using Lightroom Classic. It had been find the night before, but when I opened it the following morning it had those error messages.

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