I think I made a change. Commiting and pushing just in case.

src/elements/Chat.java

@@ -95,13 +95,12 @@ public class Chat {
             lines = new ArrayList<String>();
 
             Map.Entry<String, ArrayList<ChatListItem>> entry = (Map.Entry<String, ArrayList<ChatListItem>>) it.next();
-            lines.add("#List name:");
-            lines.add("#" + entry.getKey());
+            lines.add(entry.getKey());
 
             if(name != null) {
-                lines.add("#Chat name:");
-                lines.add("#" + name);
+                lines.add("#Chat name: " + name);
             }
+            lines.add("#List name: " + entry.getKey());
 
             ArrayList<ChatListItem> list = entry.getValue();
 

src/elements/Persistence.java

@@ -60,7 +60,8 @@ public class Persistence {
 
         for(int i = 0; i < lists.size(); i++) {
             List<String> lines = lists.get(i);
-            String filename = lines.get(1).substring("#".length());
+            String filename = lines.get(1);
+            lines.remove(1);
 
             try {
                 file = Paths.get("geiserFiles/" + c.getChatId() + "/lists/" + filename + ".txt");

src/main/Main.java

@@ -1,6 +1,8 @@
 package main;
 
 import com.mashape.unirest.http.exceptions.UnirestException;
+import elements.exceptions.ReadErrorChatException;
+import elements.exceptions.ReadErrorListException;
 
 /**
  * Created by Guillermo Serrahima on 4/1/16.
@@ -16,6 +18,9 @@ public class Main {
         } catch (UnirestException e) {
             System.out.println("Unirest Error catched.");
             e.printStackTrace();
+        } catch (ReadErrorChatException | ReadErrorListException e) {
+            System.out.println("Read Error catched.");
+            e.printStackTrace();
         }
     }
 }