Sqlite3 error: unable open databese file

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C#

Windows

database

SQLite

This is my first application with sqlite3. I am using finishar.sqlite and everything works perfectly.

But since I've realesed my app's beta version, users reported this error:

Unable to open database.

But on some user's computers and my computer it's working fine.

What I have tried:

I tried this:

public static DataTable veriAl(string sqliteKomut)
    {
        DataTable dt = new DataTable();
        using (SQLiteConnection sqlCon = new SQLiteConnection("Data Source=" + Application.StartupPath + "\\Veri\\tkt.db;Version=3;New=False;Compress=True;UTF8Encoding=True;DateTimeFormat=CurrentCulture"))
        {
            sqlCon.Open();
            sqlDa = new SQLiteDataAdapter(sqliteKomut, sqlCon);
        }
        sqlDa.Fill(dt);
        return dt;
    }

and this style codes

SQLiteConnection sqlCon = new SQLiteConnection("Data Source=" + Application.StartupPath + "\\Veri\\tkt.db;Version=3;New=False;Compress=True;UTF8Encoding=True;DateTimeFormat=CurrentCulture");
public static DataTable veriAl(string sqliteKomut)
   {
       DataTable dt = new DataTable();

       sqlCon.Open();
       sqlDa = new SQLiteDataAdapter(sqliteKomut, sqlCon);
       sqlCon.Close();

       sqlDa.Fill(dt);
       return dt;
   }