I was trying new themes with my blog and this error message came after trying to activate a theme:
Fatal error: Call to undefined function wp_get_theme() in /home/metz5738/public_html/thatfluteplayer.com/wp-content/themes/local-business/functions/theme-options.php on line 8
FTP into your site (or use whatever file management application your host provides) & delete the wp-content/themes/local-business folder. This will activate the default theme and allow you back into your site. The upgrade WordPress before trying out any more new themes.
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