"Lightroom might have encountered user permissions issue on launch"

Hi Kaela,

Thanks for reaching out. We are sorry about the trouble with Lightroom Classic. We are here to help! 

Could you please confirm the exact version of  Lightroom Classic along with the specific macOS version? Have you tried any troubleshooting steps?

Bellow steps will help ensure Lightroom Classic has required permissions to access storage of your macOS machine by following these steps:

1.  Go to the System Preferences for your Mac, then Security and Privacy, then select the Privacy tab.  
2. Then select Accessibility from the list to the left & check if Lightroom Classic is added to the list with a checkmark in front of it.  
3. If Lightroom Classic is not a part of the list, please add it by unlocking the window first using the lock at the bottom left, then clicking the + Icon & navigating to the Applications folder.  
4. Also, grant permissions to Lightroom Classic under Full disk access found in the same list as Accessibility. As shown below for Lightroom Classic.

5. Once done, restart the Mac & check if it helps Lightroom Classic access the macOS storage.

We hope this helps.

Thanks

Sameer K