ERROR SAME REQUEST WITHIN A SECOND: 4

I am trying to upload a high score to dreamlo and am getting an error. "ERROR SAME REQUEST WITHIN A SECOND: 4 UnityEngine.MonoBehaviour:print(Object) HighScoreManager:FormatHighscores(String) (at Assets/Scripts/HighScoreManager.cs:68) d__10:MoveNext() (at Assets/Scripts/HighScoreManager.cs:52) UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)"

 using System.Collections;
 using UnityEngine;
 using UnityEngine.Networking;
 
 public class HighScoreManager : MonoBehaviour
 {
     const string privateCode = "";
     const string publicCode = "";
     const string webURL = "http://dreamlo.com/lb/";
 
     DisplayHighScore highscoreDisplay;
     public Highscore[] highscoresList;
     static HighScoreManager instance;
 
     void Awake()
     {
         highscoreDisplay = GetComponent<DisplayHighScore>();
         instance = this;
     }
 
     public static void AddNewHighscore(string username, int score)
     {
         instance.StartCoroutine(instance.UploadNewHighscore(username, score));
     }
 
     IEnumerator UploadNewHighscore(string username, int score)
     {
         WWW www = new WWW(webURL + privateCode + "/add/" + UnityWebRequest.EscapeURL(username) + "/" + score);
         yield return www;
 
         if (string.IsNullOrEmpty(www.error))
         {
             print("Upload Successful");
             DownloadHighscores();
         }
         else
         {
             print("Error uploading: " + www.error);
         }
     }
 
     public void DownloadHighscores()
     {
         StartCoroutine("DownloadHighscoresFromDatabase");
     }
 
     IEnumerator DownloadHighscoresFromDatabase()
     {
         WWW www = new WWW(webURL + publicCode + "/pipe/");
         yield return www;
 
         FormatHighscores(www.text);
         highscoreDisplay.OnHighscoresDownloaded(highscoresList);
     }
 
     void FormatHighscores(string textStream)
     {
         string[] entries = textStream.Split(new char[] { '\n' }, System.StringSplitOptions.RemoveEmptyEntries);
         highscoresList = new Highscore[entries.Length];
 
         for (int i = 0; i < entries.Length; i++)
         {
             string[] entryInfo = entries[i].Split(new char[] { '|' });
             string username = entryInfo[0];
             int score = int.Parse(entryInfo[1]);
             highscoresList[i] = new Highscore(username, score);
             print(highscoresList[i].username + ": " + highscoresList[i].score);
         }
     }
 }
 
 public struct Highscore
 {
     public string username;
     public int score;
 
     public Highscore(string _username, int _score)
     {
         username = _username;
         score = _score;
     }
 }

I have tried looking for a solution and have not found anything.