$args['before_widget'] and $args['afters_widget'] (or after_widget) are things you’d add to a front-end sidebar widget. They have no relevance to dashboard widgets. The call to $args['before_widget'] is likely throwing an error because it’s not set.
Also, your wp_dashboard_setup hook callback is an anonymous function. This won’t work on PHP < 5.3. So double check your PHP version.
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