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java.lang.IllegalArgumentException: Illegal group reference: group index is missing	at java.util.regex.Matcher.appendReplacement(Matcher.java:819)	at java.util.regex.Matcher.replaceAll(Matcher.java:955)	at java.lang.String.replaceAll(String.java:2223)	at max.hubbard.bettershops.Versions.SignChange.updateSigns(SignChange.java:66)	at max.hubbard.bettershops.Shops.Types.Sign.Purchase.onPurchase(Purchase.java:119)	at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor285.execute(Unknown Source)	at org.bukkit.plugin.EventExecutor$1.execute(EventExecutor.java:44)	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502)	at org.bukkit.craftbukkit.v1_9_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:231)	at net.minecraft.server.v1_9_R2.PlayerInteractManager.a(PlayerInteractManager.java:483)	at net.minecraft.server.v1_9_R2.PlayerConnection.a(PlayerConnection.java:888)	at net.minecraft.server.v1_9_R2.PacketPlayInUseItem.a(SourceFile:55)	at net.minecraft.server.v1_9_R2.PacketPlayInUseItem.a(SourceFile:11)	at net.minecraft.server.v1_9_R2.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at net.minecraft.server.v1_9_R2.SystemUtils.a(SourceFile:45)	at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:818)	at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:403)	at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:728)	at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:627)	at java.lang.Thread.run(Thread.java:745)