JS Error

Location of error: /wp-content/plugins/contact-form-7-city-field-extension/js/script.js

Type of error: Uncaught ReferenceError: map is not defined

Location of error: line: 9, column: 49

Line says:
places = new google.maps.places.PlacesService(map);

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How do I fix this?

Thank you.

https://wordpress.org/plugins/contact-form-7-city-field-extension/