Dynamic Link error....can not load images or videos all of a sudden into LR on my iMAC. Nothing has changed....just the other day I turned on the iMAC and opened up LR! Called Adobe they did screen sharing and told me they can fix the problem !!
Please give your computer the "once over"! Run Onyx (https://www.titanium-software.fr/en/onyx.html), reboot. Not fixed? Run Disk Warrior (https://www.alsoft.com), reboot. Also, try it from another (admin) account, as a test. Can you import from this other account into a new catalog? If you can, then maybe it's a preference in your yourusername/Library/ApplicationSupport/Adobe? Check The Lightroom Queen site (https://www.lightroomqueen.com)for instructions on how to reset your preferences, or, if that doesn't work you could try deleting that entire Adobe folder, or use App Cleaner to completely delete everything Adobe and reinstall it (Last Resort!)