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When I upgraded from Version 1.7 to Version 1.8, I get this:
Fatal error: Uncaught Error: Call to undefined function wp_get_current_user() in D:\site.dev\wwwroot\wp-includes\capabilities.php:1073
Stack trace: #0 D:\site.dev\wwwroot\wp-content\plugins\restore-classic-widgets\restore_classic_widgets.php(71): is_super_admin()
#1 D:\site.dev\wwwroot\wp-settings.php(447): include_once('D:\\site.dev...')
#2 D:\site.dev\wwwroot\wp-config.php(104): require_once('D:\\site.dev...')
#3 D:\site.dev\wwwroot\wp-load.php(50): require_once('D:\\site.dev...')
#4 D:\site.dev\wwwroot\wp-blog-header.php(13): require_once('D:\\site.dev...')
#5 D:\site.dev\wwwroot\index.php(17): require('D:\\site.dev...')
#6 {main} thrown in D:\site.dev\wwwroot\wp-includes\capabilities.php on line 1073