/banlist and /deop giving an internal error when used.

Whenever I use the /banlist command it says this "An internal error has occurred while attempting to perform this command.". And when I use /deop and then press tab it gives me an internal error too but it says "An internal error occurred while attempting to tab-complete this command."

Error for /banlist: http://pastebin.com/EzxGqnNg

Error for /deop: http://pastebin.com/TWUHSP3p