My Minecraft username is Henry, and when I do /questsadmin stats henry, I get this error: http://pastebin.com/wED1KSh9 and an internal error occurred when doing the command with the wrong capitalisation.

It has to be the correct capitalisation of the username, is there anyway to fix this?

Also, some people on the server might want to see other's Quests Stats, could you maybe make the /quests stats command work like the following; when someone does /quests stats it gives them their stats, but when they do /quests stats 'player' it gives them the stats of another player? Thanks.

You're using a dev build that included the PlayerFinder class, which was not applied to later builds. Please update to a newer build.

Once you do, give players the 'quests.admin.stats' permission to allow them to check stats of other players.