Lorti UI Remake is updated for 8.3.0 and created earlier this year. You may have stumbled across some errors they haven't seen yet, but seeing as there are over 4k downloads this month with no apparent error reports similar to what you are seeing my initial thought that another addon is the one causing the error.
I would suggest that you report the problem on the issues page on Curseforge.
https://www.curseforge.com/wow/addon...-remake/issues
But, first make sure you are using the latest version of the addon which was updated earlier this month.