Getting Map API Key Errors on Wordpress Site - wordpress

Question

Having trouble with this page loading my google map correctly. I am trying to help a friend with this but I am stumped. The script to call in the API key is in there once but I am getting the following errors:
You have included the Google Maps JavaScript API multiple times on this page. This may cause unexpected errors.
Invalid Map Key
Am I formatting this wrong?
<?php
$lat = 41.01413965527589;
$long = -102.53826150000003;
$pg_lat = get_field('pg_latitude');
$pg_long = get_field('pg_longitude');
if ( !is_null($pg_long) ) {
$long = $pg_long;
}
if ( !is_null($pg_lat) ) {
$lat = $pg_lat;
}
$map_theme = get_field('pg_map_styles');
$styles_file = get_template_directory() . '/assets/styles/map_styles.json';
$map_styles = file_get_contents($styles_file);
?>
<script async defer src="https://maps.googleapis.com/maps/api/js?key=AlzaSyBYE1TZJEILsqvtODWyqh0okG7Ts1PNzv8&callback=initMap"
type="text/javascript"></script>
<script>
function initialize() {
var map;
var layer_0;
var layer_1;
var styles = <?php echo $map_styles; ?>;
var map_style = [];
var user_style = styles['<?php echo $map_theme; ?>'];
if (user_style && user_style['style'] != 'undefined') {
map_style = user_style['style'];
}
else {
var default_style = styles['Light Dream'];
if (default_style && default_style['style'] != 'undefined') {
map_style = default_style['style'];
}
}
map = new google.maps.Map(document.getElementById('map-canvas'), {
center: new google.maps.LatLng(<?php echo $lat; ?>, <?php echo $long; ?>),
zoom: 15,
styles: map_style
});
layer_0 = new google.maps.FusionTablesLayer({
suppressInfoWindows: true,
clickable: false,
query: {
select: "col8",
from: "13zAsmjWdE-uVeVPkr-1qqUQGfZFgPBnBwbNpsWEE"
},
map: map,
styleId: 2,
templateId: 2
});
layer_1 = new google.maps.FusionTablesLayer({
query: {
select: "col2",
from: "1nhy-62Mdybjlipp3_kPrmZb_E4Z7fFjBVhNarqGk"
},
map: map,
styleId: 2,
templateId: 2
});
}
window.onload = initialize;
</script>

Answer 1

Your callback function is "initialize" so put this function in url after api key and also re-create api. and then try it.