Błąd podczas uruchamiania pluginu Skript

Witam podczas uruchamiania pluginu Skript wyskakuje takowy błąd:

Error occurred while enabling Skript v2.5-alpha3 (Is it up to date?)
java.lang.NoSuchMethodError: org.bukkit.inventory.meta.PotionMeta.getBasePotionData()Lorg/bukkit/potion/PotionData;
	at ch.njol.skript.aliases.ItemData.compareItemMetas(ItemData.java:448) ~[?:?]
	at ch.njol.skript.aliases.ItemData.matchAlias(ItemData.java:379) ~[?:?]
	at ch.njol.skript.aliases.AliasesMap.exactMatch(AliasesMap.java:217) ~[?:?]
	at ch.njol.skript.aliases.AliasesProvider.addAlias(AliasesProvider.java:285) ~[?:?]
	at ch.njol.skript.aliases.AliasesParser.loadSingleAlias(AliasesParser.java:705) ~[?:?]
	at ch.njol.skript.aliases.AliasesParser.loadAlias(AliasesParser.java:605) ~[?:?]
	at ch.njol.skript.aliases.AliasesParser.load(AliasesParser.java:123) ~[?:?]
	at ch.njol.skript.aliases.Aliases.load(Aliases.java:504) ~[?:?]
	at ch.njol.skript.aliases.Aliases.load(Aliases.java:490) ~[?:?]
	at ch.njol.skript.aliases.Aliases.lambda$1(Aliases.java:473) ~[?:?]
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) ~[?:1.8.0_201]
	at java.util.ArrayList.forEach(ArrayList.java:1257) ~[?:1.8.0_201]
	at java.util.stream.SortedOps$RefSortingSink.end(SortedOps.java:390) ~[?:1.8.0_201]
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_201]
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) ~[?:1.8.0_201]
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[?:1.8.0_201]
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[?:1.8.0_201]
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_201]
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[?:1.8.0_201]
	at ch.njol.skript.aliases.Aliases.loadDirectory(Aliases.java:466) ~[?:?]
	at ch.njol.skript.aliases.Aliases.loadInternal(Aliases.java:432) ~[?:?]
	at ch.njol.skript.aliases.Aliases.load(Aliases.java:404) ~[?:?]
	at ch.njol.skript.Skript.onEnable(Skript.java:405) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]