Hi all I’m trying to create a very simple Clicker demo on Phaser 3 but Im stuck, Im unable to call any functions, this is my complete code I marked my errors with <=== for ease, could anyone please assists? I have no idea what Im doing wrong and do please tell me if the whole thing is wrong as well I would really appreciate this thanks a lot all. 
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the error is: Uncaught TypeError: this.setScore is not a function
Please find code below:
var config = {
type: Phaser.AUTO,
width: 800,
height: 600,
scene: {
preload: preload,
create: create,
update: update
}
};
var game = new Phaser.Game(config);
var Game = {};
var mainscore;
var mainscoreText;
var visits;
var visitsText;
function preload ()
{
this.load.image('enemy', '/images/enemy.png');
}
function create ()
{
mainscoreText = this.add.text(16, 16, 'Score: 0', { fontSize: '32px', fill: '#fff' });
this.setScore(); <=============================================my ERROR starts here
visitsText = this.add.text(16, 100, 'Visits: 0', { fontSize: '32px', fill: '#fff' });
this.setVisits(); <=============================================OR HERE IF I COMMENT OUT THE OTHER FUNCTION
var skeleton = this.add.image(400,300,'enemy').setInteractive();
skeleton.on('pointerdown', function (pointer) {
this.setTint(0xff0000);
this.updateScore(10);
mainscoreText.setText('Score: ' + mainscore);
});
skeleton.on('pointerout', function (pointer) {
this.clearTint();
});
skeleton.on('pointerup', function (pointer) {
this.clearTint();
});
}
function update ()
{
}
function render()
{
}
function setScore()
{
this.scene.mainscore = parseInt(localStorage.getItem('mainscore')) || 0;
this.scene.scoreTxt.setText(this.scene.mainscore);
}
function setVisits()
{
this.scene.visits = (parseInt(localStorage.getItem('visits')) || 0) + 1;
this.scene.visitsTxt.setText(this.scene.visits);
localStorage.setItem('visits',this.scene.visits);
}
function saveFile()
{
var file = {
score: this.scene.mainscore,
visits: this.scene.visits
};
localStorage.setItem('saveFile',JSON.stringify(file));
}
function loadFile()
{
var file = JSON.parse(localStorage.getItem('saveFile'));
this.scene.score = file.mainscore;
this.scene.visits = file.visits;
}
function updateScore()
{
this.scene += increment;
this.scene.mainscoreText.setText(this.scene.mainscore);
localStorage.setItem('mainscore', this.scene.mainscore);
}