autorank error and another problem :D

[03:45:43] [Thread-24/INFO]: [Autorank] Could not find name of account with uuid: '0661bea6-fc27-3b9a-810b-6df59d18f9a8'
[03:45:43] [Thread-24/WARN]: Unexpected token END OF FILE at position 0.
[03:45:43] [Thread-24/WARN]: at org.json.simple.parser.JSONParser.parse(JSONParser.java:257)
[03:45:43] [Thread-24/WARN]: at org.json.simple.parser.JSONParser.parse(JSONParser.java:81)
[03:45:43] [Thread-24/WARN]: at org.json.simple.parser.JSONParser.parse(JSONParser.java:75)
[03:45:43] [Thread-24/WARN]: at me.armar.plugins.autorank.util.uuid.NameFetcher.call(NameFetcher.java:98)
[03:45:43] [Thread-24/WARN]: at me.armar.plugins.autorank.util.uuid.UUIDManager$1.run(UUIDManager.java:176)
[03:45:43] [Thread-24/WARN]: at java.lang.Thread.run(Unknown Source)
[03:45:43] [pool-3-thread-10/WARN]: Exception in thread "pool-3-thread-10"
[03:45:43] [pool-3-thread-10/WARN]: org.apache.commons.lang.UnhandledException: Plugin Autorank v3.4 generated an exception while executing task 81
at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Null or empty name passed! Name must not be empty
at ru.tehkode.permissions.PermissionManager.getUser(PermissionManager.java:162)
at net.milkbowl.vault.permission.plugins.Permission_PermissionsEx.getUser(Permission_PermissionsEx.java:247)
at net.milkbowl.vault.permission.plugins.Permission_PermissionsEx.playerHas(Permission_PermissionsEx.java:298)
at net.milkbowl.vault.permission.Permission.playerHas(Permission.java:113)
at me.armar.plugins.autorank.leaderboard.Leaderboard.getSortedPlaytimes(Leaderboard.java:106)
at me.armar.plugins.autorank.leaderboard.Leaderboard.updateLeaderboard(Leaderboard.java:185)
at me.armar.plugins.autorank.leaderboard.Leaderboard$2.run(Leaderboard.java:84)
at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:53)
at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
... 3 more
how i can fix that ?

next problem !

i use CustomEnchantments plugin but only ops can use spells ; normal players cant use any spell i cant find any permmison. http://dev.bukkit.org/bukkit-plugins/custom-enchantments/pages/permissions/ there is no permmison players can use all spells. ;O

okei i found the problem... crap plugin

Permissions
http://dev.bukkit.org/bukkit-plugins/custom-enchantments/pages/permissions/ Players can still obtain the enchantments, they just can't use them in the end!

NOTICE:
You can ask for the default config file via PM

It will explain all the parts of the config and if problems occur, can be used to fix errors. This Config will always be updated for the newest version of the plugin

EDIT by Moderator: merged posts, please use the edit button instead of double posting.