java.lang.IllegalArgumentException: Illegal group reference: group index is missing

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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.CreateSign$1.run(CreateSign.java:149)
at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftTask.run(CraftTask.java:58)
at org.bukkit.craftbukkit.v1_9_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:352)
at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:827)
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)

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