Running Supporter 3.0 beta on new MS install, minimal plugins.

If I go to 'Settings' and change anything in General Setting or Email Notifications, it fails
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Fatal error: Call to a member function get_page_permastruct() on a non-object in home/agric/public_html/wp-includes/link-template.php on line 276
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Here's Line 276
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$link = $wp_rewrite->get_page_permastruct();
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When do you anticipate to be out of Beta?
Thanks!