SPL pixelmon error

10.03 00:02:57 [Server] pool-3-thread-2/INFO [VotifierListener]: VinceOrlando just voted and got a reward! You can too with /vote
10.03 00:02:57 [Server] Sponge Could not pass VotifierEvent to org.spongepowered.mod.plugin.SpongeModPluginContainer@19fbb675
10.03 00:02:57 [Server] INFO java.lang.IllegalArgumentException: bound must be positive
10.03 00:02:57 [Server] INFO at java.util.Random.nextInt(Random.java:388) ~[?:1.8.0_74]
10.03 00:02:57 [Server] INFO at io.github.hsyyid.votifierlistener.VotifierListenerPlugin.onVote(VotifierListenerPlugin.java:189) ~[VotifierListenerPlugin.class:0.4]
10.03 00:02:57 [Server] INFO at org.spongepowered.common.event.listener.VotifierEventListener_VotifierListenerPlugin_onVote31.handle(Unknown Source) ~[?:?]
10.03 00:02:57 [Server] INFO at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:86) ~[RegisteredListener.class:1.8.9-1763-4.1.0-BETA-1193]
10.03 00:02:57 [Server] INFO at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:238) ~[SpongeModEventManager.class:1.8.9-1763-4.1.0-BETA-1193]
10.03 00:02:57 [Server] INFO at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:282) ~[SpongeModEventManager.class:1.8.9-1763-4.1.0-BETA-1193]
10.03 00:02:57 [Server] INFO at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:250) ~[SpongeModEventManager.class:1.8.9-1763-4.1.0-BETA-1193]
10.03 00:02:57 [Server] INFO at com.vexsoftware.votifier.sponge.VotifierPlugin$3.run(VotifierPlugin.java:356) ~[VotifierPlugin$3.class:?]
10.03 00:02:57 [Server] INFO at org.spongepowered.api.scheduler.Task$Builder.lambda$execute$10(Task.java:138) ~[Task$Builder.class:1.8.9-1763-4.1.0-BETA-1193]
10.03 00:02:57 [Server] INFO at org.spongepowered.common.scheduler.SchedulerBase.lambda$startTask$68(SchedulerBase.java:177) ~[SchedulerBase.class:1.8.9-1763-4.1.0-BETA-1193]
10.03 00:02:57 [Server] INFO at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_74]
10.03 00:02:57 [Server] INFO at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_74]
10.03 00:02:57 [Server] INFO at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_74]
10.03 00:02:57 [Server] INFO at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_74]
10.03 00:02:57 [Server] INFO at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74]