Can't open the Spawn Menu in my server

Hey there, I got my server all up and ready and whatnot, but after I added the superadmins and admins in the users txt file and set the limits for every spawnable object in the server cfg file, the spawn menu stopped working. I just (obviously) gave myself superadmin privileges, so that may have something to do with it. I’ve found the file it’s complaining about, but I don’t know how to fix it. I looked in my normal, not-server garrysmod folder, hoping to simply replace the file with one I know worked, but it didn’t have the folder that the file was in. I could at least open the spawn menu before these most recent changes. Help please?

What file is it complaining about?
Are you sure you’re running Sandbox or a derivative of it (DarkRP, etc.)?