@skol: That looks to be from double entries in the photoplog_customfields database table. Do you remember what you did right beofre that occurred? If you post the content of the photoplog_customfields table, I can tell you what rows to remove (or you can figure it out by looking where the doubles are based on catid in that table).
@angeljs and @davidg: If you receive an error like this:
Code:
... Failed opening required '/home/board/admincp/photoplog_plugins.php' ...
Update: I thought that (a) you didn't FTP all the PhotoPlog files to the server or (b) you FTPed them to the wrong place, but I received a PM with a clue, sorry, I'll look into this.