SqliteException: SQLite error no such table

I've been looking for solutions since yesterday and I can't seem to find any. It always says there's no such table when I try to insert a record on my database.

Error Details: Mono.Data.Sqlite.SQLite3.Prepare (Mono.Data.Sqlite.SqliteConnection cnn, System.String strSql, Mono.Data.Sqlite.SqliteStatement previous, UInt32 timeoutMS, System.String& strRemain) Mono.Data.Sqlite.SqliteCommand.BuildNextCommand () UnityEngine.EventSystems.EventSystem:Update()

This is my code:

connectionString = "URI=file:" + Application.persistentDataPath + "/ReportCards.sqlite";

string filepath = Application.persistentDataPath + "/" + "ReportCards.sqlite";

             if (!File.Exists (filepath)) 
             {
                          WWW loadDB = new WWW ("jar:file://" + Application.dataPath + "!/assets/" + "ReportCards.sqlite");
                     while (!loadDB.isDone) {}
                     File.WriteAllBytes (filepath, loadDB.bytes);

             }

             connectionString = "URI=file:" + filepath;

             dbcon = new SqliteConnection (connectionString);
             dbcon.Open ();

private void InsertScore(string name ,int score, int time, string remarks) {

             if (playerScore >= 5 && playerScore<= 26) 
             {
                     remarks = "EXCELLENT";
             } 
             else if (playerScore == 4) 
             {
                     remarks = "OUTSTANDING";
             } 
             else if (playerScore == 3) 
             {
                     remarks = "VERY GOOD";
             }
             else if (playerScore == 2) 
             {
                     remarks = "GOOD";
             }
             else if (playerScore == 1) 
             {
                     remarks = "FAIR";
             }
             else if (playerScore == 0) 
             {
                     remarks = "NEEDS IMPROVEMENT";
             }

             using (IDbConnection dbConnection = new SqliteConnection (connectionString)) 
             {
                     dbConnection.Open ();

                     using (IDbCommand dbCmd = dbConnection.CreateCommand ()) 
                     {
                             string sqlQuery = String.Format ("INSERT INTO LetterRecognition(Name,Score,TimeConsumed_Seconds,Remarks)VALUES(\"{0}\",\"{1}\",\"{2}\",\"{3}\")" ,name,score,time,remarks);

                             dbCmd.CommandText = sqlQuery;
                             dbCmd.ExecuteScalar ();
                             dbConnection.Close ();


                     }
             }
     }