[14:46:38 WARN]: Exception in thread "Craft Scheduler Thread - 3"
[14:46:38 WARN]: org.apache.commons.lang.UnhandledException: Plugin ShoppingCart v1.2 generated an exception while executing task 54
        at org.bukkit.craftbukkit.v1_9_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.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player;
        at org.mcstats.Metrics.postPlugin(Metrics.java:335)
        at org.mcstats.Metrics.access$400(Metrics.java:57)
        at org.mcstats.Metrics$1.run(Metrics.java:223)
        at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_9_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more