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java.lang.IllegalArgumentException: Illegal group reference: group index is missing at java.util.regex.Matcher.appendReplacement(Matcher.java:819)[?:1.8.0_91] at java.util.regex.Matcher.replaceAll(Matcher.java:955)[?:1.8.0_91] at java.lang.String.replaceAll(String.java:2223)[?:1.8.0_91] at max.hubbard.bettershops.Versions.SignChange.updateSigns(SignChange.java:66)[?:?] at max.hubbard.bettershops.Shops.Types.Sign.CreateSign$1.run(CreateSign.java:149)[?:?] at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftTask.run(CraftTask.java:58)[server.jar:git-Paper-741] at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:352)[server.jar:git-Paper-741] at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:827)[server.jar:git-Paper-741] at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:403)[server.jar:git-Paper-741] at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:728)[server.jar:git-Paper-741] at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:627)[server.jar:git-Paper-741] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_91]