Trigger action via button

Remove this line 

add_action( 'wp_ajax_my_action', 'updateContent' );

Add this two Line

add_action( 'wp_ajax_nopriv_updateContent', 'updateContent' );
add_action( 'wp_ajax_updateContent', 'updateContent' );

hopefully it will solve your issue

https://codex.wordpress.org/Plugin_API/Action_Reference/wp_ajax_nopriv_(action)

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