Hi. I'm using AutoRank and on console when i start the server appear this:

01.07 16:21:56 [Server] WARN at me.armar.plugins.autorank.util.uuid.NameFetcher.call(NameFetcher.java:98)
01.07 16:21:56 [Server] WARN at org.json.simple.parser.JSONParser.parse(JSONParser.java:75)
01.07 16:21:56 [Server] WARN at org.json.simple.parser.JSONParser.parse(JSONParser.java:81)
01.07 16:21:56 [Server] WARN at org.json.simple.parser.JSONParser.parse(JSONParser.java:257)
01.07 16:21:56 [Server] WARN Unexpected token END OF FILE at position 0.
01.07 16:21:56 [Server] INFO Could not find name of account with uuid: 'b233b53c-2516-3ca6-bc0f-3a1da696d715'
01.07 16:21:56 [Server] WARN at java.lang.Thread.run(Unknown Source)
01.07 16:21:56 [Server] WARN at me.armar.plugins.autorank.util.uuid.UUIDManager$1.run(UUIDManager.java:176)
01.07 16:21:56 [Server] WARN at me.armar.plugins.autorank.util.uuid.NameFetcher.call(NameFetcher.java:98)
01.07 16:21:56 [Server] WARN at org.json.simple.parser.JSONParser.parse(JSONParser.java:75)
01.07 16:21:56 [Server] WARN at org.json.simple.parser.JSONParser.parse(JSONParser.java:81)
01.07 16:21:56 [Server] WARN at org.json.simple.parser.JSONParser.parse(JSONParser.java:257)
01.07 16:21:56 [Server] WARN Unexpected token END OF FILE at position 0.
01.07 16:21:56 [Server] INFO Could not find name of account with uuid: '5b1eaee8-83ef-3d65-bfe0-27bcc125e43f'

I'm using spigot 1.8 and last version of autorank (i also check other version of ar).
Pls i must fix this.