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Do you get a blank screen, or a dashboard with missing buttons?

You could troubleshoot by trying the following:

a) deactivate your plugins one by one, by changing their folder names temporarily in the /plugins/ folder on your ftp server. Try refreshing your dashboard each time to see if you get it back. This may identify a plugin that’s conflicting with your new WordPress install.

b) do the same thing with your theme folders, until only /twentytwelve/ or /twentyeleven/ is left.

c) if neither of those work, upload a fresh version of WordPress, deleting all WordPress files EXCEPT wp_content folder. (IMPORTANT! if you don’t want to lose all your content) Log in again and see if that fixes it.

Let us know!

It’s not on twentytwelve now, and I don’t see the error you’re getting. Have you figured out the problem?

I found a thread dealing with the same issue, you could try their suggestion! Unfortunately, nobody wrote back to say whether it worked.

http://wordpress.org/support/topic/how-to-not-display-certain-categories-in-post-meta-data?replies=4

Awesome, glad it worked out.

Could you put all the plugin folders on hold, then rename the parent folder to ‘plugins’? What happens?

You can create a home page template without sidebars by doing the following:

1. Create a child theme.

2. Copy the contents of index.php in the original theme into a new file and save it as home.php in your child theme.

3. Remove the code in your newly-made home.php file that displays the sidebar:
<?php get_sidebar(); ?>

4. Activate your child theme and see if it removes the sidebar from your home page.

Here are a number of options: Installing WordPress Locally

Hope that helps! Come back if you have questions.