There is a typo in english lang file. Open

oxide/lang/en/TimedCommandBlocker.json​

find

["Blocked"] = "Command <color={1}}>{0}</color> is blocked.",

and replace it with

["Blocked"] = "Command <color={1}>{0}</color> is blocked.",

I will send patch shortly

P.S. and you better remove lang and conf files, update plugin and then fix written above