Which file does it say that it can't open? If it's "descriptions.txt" then your album directory isn't writable for the web server.
You can "pretty much" customize the header using descriptions.txt, though there are some things you can't [yet] change. I didn't modify any code for my CdnArmy gallery. I'm also going to try to make it more flexible.
But, if the descriptions.txt doesn't cut it, and you want to modify the code itself, just look for "sub buildAlbumHeader" and that's where the header gets built. Hopefully you don't have to resort to that though, as subsequent upgrades would be a real pain.
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