4 files changed, 8 insertions, 4 deletions
diff --git a/sources/utils/VSFrame.java b/sources/utils/VSFrame.java
index ad2b54c..b3a43b5 100644
--- a/sources/utils/VSFrame.java
+++ b/sources/utils/VSFrame.java
@@ -13,7 +13,8 @@ import javax.swing.JFrame;
  * The Class VSFrame.
  */
 public class VSFrame extends JFrame {
-    
+	private static final long serialVersionUID = 1L;
+	
     /** The Constant X_LOCATION_OFFSET. */
     private final static int X_LOCATION_OFFSET = 40;
     
diff --git a/sources/utils/VSInfoArea.java b/sources/utils/VSInfoArea.java
index 241b8f8..bb485b9 100644
--- a/sources/utils/VSInfoArea.java
+++ b/sources/utils/VSInfoArea.java
@@ -13,7 +13,8 @@ import javax.swing.border.*;
  * The Class VSInfoArea.
  */
 public class VSInfoArea extends JTextPane {
-    
+	private static final long serialVersionUID = 1L;
+	
     /**
      * Instantiates a new vS info area.
      */
diff --git a/sources/utils/VSPriorityQueue.java b/sources/utils/VSPriorityQueue.java
index 7458a54..da83fe6 100644
--- a/sources/utils/VSPriorityQueue.java
+++ b/sources/utils/VSPriorityQueue.java
@@ -11,7 +11,8 @@ import java.util.PriorityQueue;
  * The Class VSPriorityQueue.
  */
 public final class VSPriorityQueue<T> extends PriorityQueue<T> {
-    
+	private static final long serialVersionUID = 1L;
+	
     /**
      * Gets the.
      * 
diff --git a/sources/utils/VSRandom.java b/sources/utils/VSRandom.java
index 088da4f..bd449d6 100644
--- a/sources/utils/VSRandom.java
+++ b/sources/utils/VSRandom.java
@@ -11,7 +11,8 @@ import java.util.Random;
  * The Class VSRandom.
  */
 public final class VSRandom extends Random {
-    
+	private static final long serialVersionUID = 1L;
+	
     /**
      * Instantiates a new vS random.
      *