Unexpected error opening catalog

[iant9296161]

Hi, are you able to sort out a problem with Lightroom Classic? The error message is "Unexpected error opening catalogue". I have been looking in the chat rooms for answers. Yes, I've rebooted the HDD, Yes I've deleted the catalogue and replaced it with the backup catalogue but noting I try gets me passed the error message. My problems started 26/12/2020. 

[dj_paige]

Take the backup catalog, put it on a different disk, and see if it opens from there.