packman repo problem

[fishin4guitars]

I'm getting an "Unknown GnuPG Key" error when I refresh the Packman repo. I know that if I was adding the repo, something like this would be expected, but it's been in my list for a while. The body of the error is as follows:

The file repomd.xml (http://pacman.inode.at/suse/openSUSE_11.4/) is digitally
signed with the following unknown GnuPG key:
ID:.
This means that a trust relationship to the creator of the 
file cannot be established. Using the file may put the 
integrity of your system at risk.

Has anyone else had this error?
Might there be a problem on my system that's causing this?
Would switching to a different mirror fix this?

I'm going to try deleting then re-adding it, and if that doesn't work, try a different mirror.

I'm being cautious because I've only used Debian based distros previously, and I'm sure I don't have OpenSUSE's repo conventions down yet.

Update 1:
I tried re-adding it, didn't work.

[whych]

How did you add it?
Did you just add the url or did you go to:
Yast2>Software>Repos>Add Repo>Community Repos
and add it there?
It should automaticly give you the nearest mirror site.
(Sorry, but I'm not running Suse on any of my boxes at the moment, so can't be more specific)

[fishin4guitars]

Well, I got the url for it from Additional package repositories - openSUSE. The url I used is Index of /suse/openSUSE_11.4/ . Well, I just tried using YaST, and the method you described worked. Thanks