issues with wp_enqueue_script in my plugin

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You need to hook into admin_enqueue_scripts with your add_my_script function.

http://codex.wordpress.org/Plugin_API/Action_Reference/admin_enqueue_scripts

Example:

function add_my_script() {
    wp_enqueue_script('qtool-insert-v2');
}add_action( 'admin_enqueue_scripts', 'add_my_script' );