error

12:59:59 [SEVERE] Exception in thread "pool-1-thread-192"
12:59:59 [SEVERE] org.apache.commons.lang.UnhandledException: Plugin EmeraldEconLink v2.0 Beta generated an exception while executing task 136463
        at org.bukkit.craftbukkit.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.IllegalStateException: Start block missed in BlockIterator
        at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:169)
        at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:231)
        at org.bukkit.util.BlockIterator.<init>(BlockIterator.java:264)
        at org.bukkit.craftbukkit.entity.CraftLivingEntity.getLineOfSight(CraftLivingEntity.java:96)
        at org.bukkit.craftbukkit.entity.CraftLivingEntity.getTargetBlock(CraftLivingEntity.java:122)
        at me.fonkfader.EmeraldEconLink.Checks$4.run(Checks.java:385)
        at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:53)
        at org.bukkit.craftbukkit.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more