Basically, check the new library folder and delete any files, directories, whatever that are in it. What calibre will expect to see is an empty directory. An example from Terminal is:
Code:
davidb@Davids-VMMac calibre % mkdir "Calibre Library 2022"
davidb@Davids-VMMac calibre % cd "Calibre Library 2022"
davidb@Davids-VMMac Calibre Library 2022 % ls -alr
total 0
drwxr-xr-x 3 davidb staff 96 2 Mar 08:32 ..
drwxr-xr-x 2 davidb staff 64 2 Mar 08:32 .
davidb@Davids-VMMac Calibre Library 2022 %
If ls -alr shows files/directories, you can use rm to remove files in the directory and rmdir to remove directories but be very careful that you are in the right place before doing this.