what's the meaning of this error in sqlite ?

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C#

SQLite

Hi.
Can someone please help me to understand the meaning of this peculiar sqlite error and what's the cause of it ?
it's in C#
and here's my C# code.

try
            {
                string query = @"insert into tbl (pkey, field)
                            values (@_pkey, @_txt);";

                string conString = @"Data Source = \testdb.s3db; version = 3;";
                SQLiteConnection con = new SQLiteConnection(conString);
                con.Open();
                SQLiteCommand cmd = new SQLiteCommand(query, con);
                cmd.Parameters.Add("@_pkey", System.Data.DbType.Int32).Value = 10;
                cmd.Parameters.AddWithValue("@_txt", "hello world");
                cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            { Console.WriteLine(ex.Message); }

But when I click the run, it displays this in the cmd.

SQL logic error or missing database
no such table: tbl
Press any key to continue . . .

And Im dead sure that there's a database and a table which fits the queries.
I tried changing the table name.

What's the wrong with this ?

Thanks in advance.