When you install a Site from the Library – GP creates a ‘snapshot’ of the site before the install goes ahead, which is what it uses to provide you the option to revert those changes when selecting a new site.
But on your site its storing this value agains this user string: ?_locale=user which is failing as it doesn’t exist after the site import. This will be to do with how your local server is storing user data. And i can’t really advise on how to change that behaviour.
If you’re working on a clean install, try installing the WP Reset plugin, which will roll the site back to a clean install.