Notice: Undefined offset: 1 in /home/htscadmn/public_html/wp-content/plugins/youtube-channel-gallery/youtube-channel-gallery.php on line 1213
Error type: "Bad Request". Error message: "API key not valid. Please pass a valid API key." Domain: "global". Reason: "badRequest".

Did you added your own Google API key? Look at the help.

Check in YouTube if the id hasantascivideo belongs to a username. Check the FAQ of the plugin or send error messages to support.