Blog category links not working

Hello, I am having trouble with the “category” and “archive” links in my blog:

https://www.spinpoi.com/wordpress/blog/

When you click on the category links, I am getting this error.

Fatal error: Call to undefined function get_the_other_excerpt() in /home/krvw/spinpoi.com/wordpress/wp-content/themes/spasalon-child/category.php on line 27

Clicking on the archive links doesn’t produce and error, but it also doesn’t actually take you to the archive. I’ve read that this issue often has to do with permalinks, but I’ve reset those and tried using the default links and it makes no difference. I’ve also tried changing the permissions for my .htaccess file but that didn’t seem to effect it. Any help would be much appreciated. Thank you!