.NET Oracle SP call errors ORA-00604 and ORA-01001 when pass

var totalNumRowsParam = new OracleParameter("total_num_rows", OracleType.Int32) { Direction = ParameterDirection.Output };
var resultsParam = new OracleParameter("results", OracleType.Cursor) { Direction = ParameterDirection.Output };
var temp = new List<Blah>();
using (var conn = new OracleConnection(connectionString))
{
    conn.Open();

    using (var command = conn.CreateCommand())
    {
        command.CommandType = CommandType.StoredProcedure;
        command.CommandText = "blah_search";

        command.Parameters.Add(new OracleParameter("start_index", (object)0));
        command.Parameters.Add(new OracleParameter("num_rows", (object)100000));
        command.Parameters.Add(totalNumRowsParam);
        command.Parameters.Add(resultsParam);
        command.Parameters.Add(new OracleParameter("results1", OracleType.Cursor) { Direction = ParameterDirection.Output });

        OracleString s;
        command.ExecuteOracleNonQuery(out s);
        using(var reader = (OracleDataReader)resultsParam.Value)
        {
            while (reader.Read())
            {
                var item = new Blah();
                temp.Add(item);
                item.Name = (string)reader["name"]; // ...
            }
        }
    }
}