diff --git a/src/main/java/com/github/kory33/signvote/constants/Formats.java b/src/main/java/com/github/kory33/signvote/constants/Formats.java
index ad14a68..473ca84 100644
--- a/src/main/java/com/github/kory33/signvote/constants/Formats.java
+++ b/src/main/java/com/github/kory33/signvote/constants/Formats.java
@@ -1,6 +1,8 @@
 package com.github.kory33.signvote.constants;
 
+import java.nio.charset.Charset;
+
 public class Formats {
-    public static final String FILE_ENCODING = "utf-8";
+    public static final Charset FILE_ENCODING = Charset.forName("utf-8");
     public static final String JSON_EXT = ".json";
 }
diff --git a/src/main/java/com/github/kory33/signvote/model/VotePoint.java b/src/main/java/com/github/kory33/signvote/model/VotePoint.java
index 8c8ce28..1de7f5f 100644
--- a/src/main/java/com/github/kory33/signvote/model/VotePoint.java
+++ b/src/main/java/com/github/kory33/signvote/model/VotePoint.java
@@ -1,5 +1,6 @@
 package com.github.kory33.signvote.model;
 
+import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
@@ -9,6 +10,7 @@
 import org.bukkit.block.BlockState;
 import org.bukkit.block.Sign;
 
+import com.github.kory33.signvote.constants.Formats;
 import com.github.kory33.signvote.constants.VotePointDataFileKeys;
 import com.github.kory33.signvote.session.VoteSession;
 import com.google.gson.JsonObject;
@@ -24,36 +26,39 @@ public VotePoint(String name, Sign voteSign, VoteSession parentSession) {
         this.name = name;
         this.voteSign = voteSign;
     }
-    
+
     public VotePoint(File votePointFIle) throws IllegalArgumentException, IOException {
-        JsonObject jsonObject = (new JsonParser()).parse(Files.newBufferedReader(votePointFIle.toPath())).getAsJsonObject();
-        
+        BufferedReader reader = Files.newBufferedReader(votePointFIle.toPath(), Formats.FILE_ENCODING);
+        JsonObject jsonObject = (new JsonParser()).parse(reader).getAsJsonObject();
+        reader.close();
+
         this.name = jsonObject.get(VotePointDataFileKeys.NAME).getAsString();
-        
-        World world = Bukkit.getWorld(jsonObject.get(VotePointDataFileKeys.VOTE_SIGN_WORLD).getAsString());
+
+        String worldName = jsonObject.get(VotePointDataFileKeys.VOTE_SIGN_WORLD).getAsString();
+        World world = Bukkit.getWorld(worldName);
         int signX = jsonObject.get(VotePointDataFileKeys.VOTE_SIGN_LOC_X).getAsInt();
         int signY = jsonObject.get(VotePointDataFileKeys.VOTE_SIGN_LOC_Y).getAsInt();
         int signZ = jsonObject.get(VotePointDataFileKeys.VOTE_SIGN_LOC_Z).getAsInt();
-        
+
         if (world == null) {
-            throw new IllegalArgumentException("Invalid file given! (world name missing)");
+            throw new IllegalArgumentException("Invalid file given! (Invalid world name " + worldName + ")");
         }
-        
+
         BlockState state = world.getBlockAt(signX, signY, signZ).getState();
         if (!(state instanceof Sign)) {
             throw new IllegalStateException("Sign does not exist at the location in the saved data!");
         }
-        
+
         this.voteSign = (Sign) state;
     }
-    
+
     /**
      * Get the json-serialized data of this object.
      * @return
      */
     public JsonObject toJson() {
         JsonObject jsonObject = new JsonObject();
-        
+
         jsonObject.addProperty(VotePointDataFileKeys.NAME, this.name);
         jsonObject.addProperty(VotePointDataFileKeys.VOTE_SIGN_WORLD, this.voteSign.getWorld().getName());
         jsonObject.addProperty(VotePointDataFileKeys.VOTE_SIGN_LOC_X, this.voteSign.getX());
diff --git a/src/main/resources/plugin.yml b/src/main/resources/plugin.yml
index 35f9dbc..cb87294 100644
--- a/src/main/resources/plugin.yml
+++ b/src/main/resources/plugin.yml
@@ -1,6 +1,7 @@
 name: @project.name@
 version: @project.version@
 main: com.github.kory33.signvote.core.SignVote
+softdepend: [MultiWorld]
 description: A Bukkit plugin that allows player to vote through signs.
 
 author: kory33