Xamarin.Android - Persistent Could Not Open Database file Exception

I was previously using a SQLiteOpenHelper,but decided to take that out and use just the SQLite.NET ORM only.After i made that change,i keep getting the "could not open database file" exception.I have tried a few suggestions from this site, e.g the approach below:

DB_PATH = Path.Combine (
            Environment.GetFolderPath (Environment.SpecialFolder.Personal));

        var conn = new SQLiteConnection (System.IO.Path.Combine (DB_PATH, DATABASE_NAME));

but the application either the application crushes or i get the same error.

Below is my code: I click on a log in button from a different activity,which is meant to verify the user's details from the database.This is where i make calls to connecting with the database.

namespace sample.App
{

[Activity (MainLauncher = true)]
public class MainActivity : Activity
{

public List<UsersTable>GetAllUserNames()
    {
        List<UsersTable> allUserNames = new List<UsersTable> ();

        allUserNames = dataManager.GetSingleUserName ();

        string name = "";

        foreach(var UserName in allUserNames)
        {
            Console.WriteLine ("Usernames from db :" + name.ToString());
        }

        return allUserNames;
    }

}
}

The DataManager class:

public List<UsersTable> GetSingleUserName()
    {
        UsersTable user = new UsersTable ();

        using (var db = dbHandler.getUserDatabaseConnection ()) {


            var userName =  db.Query<UsersTable > ("select * from UsersTable where user_name = ?", user.USER_NAME);

            return userName;
        }

    }

The DatabaseHandler class where the db is created and the connection as well

namespace com.Sample.Database
{
public class DatabaseHandler 
{

//Constructor
    private DatabaseHandler (Context context)
    {
        try
        {

string dataDirectory = Android.OS.Environment.DataDirectory.AbsolutePath;
            this.COMPANY_DATABASE_NAME = "first_" + "v" + this.databaseVersion + ".db"; 

            string employerDBPath = "/data/" + "com.employer.company" + "/databases/" + COMPANY_DATABASE_NAME;
            string userDBPath = "/data/" + "com.user.test" + "/databases/" + USER_DATABASE_NAME;


            this.COMPANY_DATABASE_NAME = dataDirectory + employerDBPath;
            this.USER_DATABASE_PATH = dataDirectory + userDBPath;
this.userDatabaseConnection = new SQLiteConnection (this.USER_DATABASE_PATH);
        this.userDatabaseConnection.CreateTable<UserInfoTable> ();
        this.InsertAdminData ();

catch(Exception ex)
        {


        }
 }
 public SQLiteConnection getNuseisDatabaseConnection()
    {
        var connection = new SQLiteConnection (this.COMPANY_DATABASE_PATH);

        return connection;

    }
}


}
}

The error is on the call to the getDatabaseException() method from the DataManager class.