02:06:07] [Craft Scheduler Thread - 78/WARN]: Exception in thread "Craft Scheduler Thread - 78"
[02:06:07] [Craft Scheduler Thread - 78/WARN]: org.apache.commons.lang.UnhandledException: Plugin CommunityBridge v2.6.0.000 generated an exception while executing task 65
at org.bukkit.craftbukkit.v1_8_R3.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: Invalid UUID string:
at java.util.UUID.fromString(Unknown Source)
at org.communitybridge.bansynchronizer.BanSynchronizer.banPlayerGame(BanSynchronizer.java:71)
at org.communitybridge.bansynchronizer.BanSynchronizer.synchronizeWebToGame(BanSynchronizer.java:248)
at org.communitybridge.bansynchronizer.BanSynchronizer.synchronize(BanSynchronizer.java:43)
at org.communitybridge.main.WebApplication.synchronizeAll(WebApplication.java:268)
at org.communitybridge.main.CommunityBridge$2.run(CommunityBridge.java:235)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
... 3 more

anyone ?!

Don't enable bans on both sides.

The ban system is just stupid. It doesn't work because it saves UUID's and tries to read UUID's out of the database