Hey, @LAURENEQUIROS. Welcome to the Lightroom Community. I'll need more info to help you figure this out. Please share the system info from Lightroom Help > System info > Copy and paste into a text document > Upload and attach here.
Does this happen with a specific set of images? Were these images imported into Lightroom on the same device or via another surface with Lightroom?
Please follow the steps and let me know how it goes:
1 - Close Lightroom
2 - Go to the following locations and delete everything inside the ModelZoo folder.
MacOS: /Library/Application Support/Adobe/CameraRaw/ModelZoo/
MacOS: ~/Library/Application Support/Adobe/CameraRaw/ModelZoo/
Note: Hold down the Option key in the Finder when using the Go menu. The library will appear below the current user's home directory.
3 - Launch Lightroom & try to export.
4 - If this does not work, you can uninstall Lightroom from the Creative Cloud desktop app and start over from step 2, and install Lightroom at step 3.
Let me know how it goes. Thanks!
Sameer K
(Type '@' and type my name to mention me when you reply)