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

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    java.lang.IllegalArgumentException: Illegal group reference: group index is missing
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    java.lang.IllegalArgumentException: Illegal group reference
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Root Cause Analysis

  1. java.lang.IllegalArgumentException

    Illegal group reference: group index is missing

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