Having trouble installing

[muke]

Hey, I'm new to Debian and I'm trying to install gmusicbrowser on my system, but I'm having trouble. After adding the repo in the sources.list file and then running the command to import the key (after installing Debian keychain), I get this error when I try to update the repo:

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W: GPG error: http://gmusicbrowser.org/deb ./ Release: The following signatures were invalid: CB5D1B931E379EA900B2EB6E2FE527580ADD8151
E: The repository 'http://gmusicbrowser.org/deb ./ Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.


Now as I'm new to Debian I may be misunderstanding, but to me this implies that the key you're given to download doesn't work? What could I be doing wrong here?