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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 com.cnaude.scavenger.RestorationManager.collect(RestorationManager.java:417)	at com.cnaude.scavenger.ScavengerEventListenerOnline.onPlayerDeathEvent(ScavengerEventListenerOnline.java:59)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:334)