Problem importing from WordPress.com

I’ve moved my wife’s blog from wordpress.com to my own server. I exported from wordpress.com, installed the Koi theme in my installed wordpress, and imported. I got a lot of “Menu item skipped due to missing menu slug” errors, and the blog doesn’t look right. All the pages are listed down the right side instead being under the custom menu bar, which is blank. I’m new to WordPress, so any help would be greatly appreciated!