Application started on port 56642
[ undefined ]

/Users/[username]/Desktop/[directory]/[directory]/web/node_modules/execsql/index.js:14
    callback(err, results);
    ^

TypeError: callback is not a function

var express = require('express');
var bodyParser = require('body-parser');
var mysql = require('mysql');

var pool = mysql.createPool({
    host: 'localhost',
    user: "root",
    password: "password",
    database: "db_test"
});

var execsql = require('execsql'),
    dbConfig = {
        host: 'localhost',
        user: 'root',
        password: 'password'
    },
    sql = 'use db_test;',
    sqlFile = __dirname + '/database/create_tables.sql';
execsql.config(dbConfig)
    .exec(sql)
    .execFile(sqlFile, function(err, results){
        console.log(results);
    }
    ).end();

var execsql = require('execsql'),
    dbConfig = {
        host: 'localhost',
        user: 'root',
        password: 'password'
    },
    sql = 'use db_test;',
    sqlFileTwo = __dirname + '/database/seed_tables.sql';
execsql.config(dbConfig)
    .exec(sql)
    .execFile(sqlFileTwo, function(err, results){
        console.log(results);
    }
    ).end();