[Plugin: Theme Test Drive] Fatal error when on options page

Fatal error: Call to undefined function wp_get_themes() in /home/bt10nl/domains/boekfragmenten.nl/public_html/wp-content/plugins/theme-test-drive/themedrive.php on line 262

I installed the plugin again, but with the same error.

https://www.ads-software.com/extend/plugins/theme-test-drive/