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'Up to date' doesn't mean anything. Tell us the exact version numbers of Lightroom and Photoshop. Because of the new profiles in Lightroom, a common cause of problems like these is a camera profile mismatch, caused by differences between versions.
Photoshop CC 19.1.5
Lightroom Classic CC 7.4
Previously I've deleted the preference folders for both programs, nothing changed. Now I've deinstalled and reinstalled both programs and it works again, don't know what happened.
Thanks to you I've checked again and reinstalled, so thank you anyway!
Update: I have no idea what went wrong, the exact same error is back.
EDIT: Final solution found. In my Taskbar I had Lightroom CC 2015 placed, which I used to manage my images. However, in the creative cloud app there's another lightroom. It seems like I've used an old version. Opening LR directly from the CC app enables me to edit my images in PS again like I was used to.
Yes, Lightroom CC2015 is the predecessor of Lightroom Classic.