[14:30:22] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoSuchMethodError: org.spongepowered.api.service.permission.SubjectCollection.getDefaults()Lorg/spongepowered/api/service/permission/Subject;
        at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_45]
        at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_45]
        at net.minecraft.util.Util.func_181617_a(SourceFile:45) [g.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:660) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:344) [ko.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45]
Caused by: java.lang.NoSuchMethodError: org.spongepowered.api.service.permission.SubjectCollection.getDefaults()Lorg/spongepowered/api/service/permission/Subject;
        at net.kaikk.mc.sponge.simplepermissions.subject.GroupSubject.getDefaultPermissionValue(GroupSubject.java:87) ~[GroupSubject.class:?]
        at net.kaikk.mc.sponge.simplepermissions.subject.GroupSubject.getPermissionValue(GroupSubject.java:83) ~[GroupSubject.class:?]
        at net.kaikk.mc.sponge.simplepermissions.subject.SimpleSubject.getDefaultPermissionValue(SimpleSubject.java:93) ~[SimpleSubject.class:?]
        at net.kaikk.mc.sponge.simplepermissions.subject.UserSubject.getPermissionValue(UserSubject.java:53) ~[UserSubject.class:?]
        at net.minecraft.entity.player.EntityPlayerMP.getPermissionValue(EntityPlayerMP.java:147) ~[lf.class:?]
        at net.minecraft.entity.player.EntityPlayerMP.hasPermission(EntityPlayerMP.java:129) ~[lf.class:?]
        at net.minecraft.entity.player.EntityPlayerMP.hasPermission(EntityPlayerMP.java:141) ~[lf.class:?]
        at org.spongepowered.common.command.SpongeCommandManager.process(SpongeCommandManager.java:310) ~[SpongeCommandManager.class:1.8.9-1890-4.2.0-BETA-1653]
        at net.minecraft.command.ServerCommandManager.func_71556_a(SourceFile:80) ~[bd.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:815) ~[lm.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:794) ~[lm.class:?]
        at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:37) ~[ie.class:?]
        at net.minecraft.network.play.client.C01PacketChatMessage.func_148833_a(SourceFile:9) ~[ie.class:?]
        at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:121) ~[PacketUtil.class:1.8.9-1890-4.2.0-BETA-1653]
        at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$0(SourceFile:39) ~[fh$1.class:?]
        at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[fh$1.class:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_45]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_45]
        at net.minecraft.util.Util.func_181617_a(SourceFile:44) ~[g.class:?]
        ... 5 more