18.05 17:25:53 [Server] SEVERE at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
18.05 17:25:53 [Server] SEVERE at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftTask.run(CraftTask.java:67)
18.05 17:25:53 [Server] SEVERE at com.bergerkiller.bukkit.sl.SignLink$2.run(SignLink.java:128)
18.05 17:25:53 [Server] SEVERE at com.bergerkiller.bukkit.sl.VirtualSignStore.updateAll(VirtualSignStore.java:115)
18.05 17:25:53 [Server] SEVERE at com.bergerkiller.bukkit.sl.VirtualSign.update(VirtualSign.java:188)
18.05 17:25:53 [Server] SEVERE at com.bergerkiller.bukkit.sl.VirtualSign.isLoaded(VirtualSign.java:161)
18.05 17:25:53 [Server] SEVERE at com.bergerkiller.bukkit.sl.VirtualSign.getWorld(VirtualSign.java:129)
18.05 17:25:53 [Server] SEVERE java.lang.NullPointerException
18.05 17:25:53 [Server] SEVERE [SignLink] An error occured while updating the signs: