WordPress at a glance
action is not described

user_profile_update_errors action-hook . WP 2.8.0

Fires before user profile update errors are returned.

Usage

add_action( 'user_profile_update_errors', 'action_function_name_7310', 10, 3 );
function action_function_name_7310( $errors, $update, $user ){
	// action...
}
$errors(WP_Error)
WP_Error object (passed by reference).
$update(true/false)
Whether this is a user update.
$user(stdClass)
User object (passed by reference).

Where the hook is called

edit_user()
wp-admin/includes/user.php 191
do_action_ref_array( 'user_profile_update_errors', array( &$errors, $update, &$user ) );

Where the hook is used (in WP core)

Does not used.