The idea was to migrate our current version to a new server, test everything to make sure it worked, then upgrade the coppermine software to a new version. But after migrating, I received the screenshot error messages above.
While a good idea - it just isn't possible if running older versions of CPG not compatible with software levels on the new server...
You still didn't confirm/verify what version you are actually running based on my last reply.
I also did try to run the /update.php -- and got the message "Upgrade completed. Coppermine is now upgraded and ready to roll. Let's continue !" but the albums still don't work.
If you just ran update/php without uploading the new version of CPG - it won't do anything different than when you ran it following your last install/upgrade...
If you skipped an upgrade step - like going from 1.3 to 1.5 - I'd expect issues as well...
I also tried installing a new copy of the updated version of the coppermine software but I don't want to have to manually add all those photos back into the albums.
No reason to have to add photos again - as long as your albums folder and database were moved intact to the new server.
It's a matter of identifying the correct upgrade path based on your current level - following the relevant docs to upgrade in place - and your pictures should all appear again.
(Having backups and/or a test copy to upgrade first is always prudent... Since you are moving from an old server - I assume you already have the backup used to populate the new server.)
We're here to help - but there is information we need to be able to do so...