[Theme Horse Support Team]

Hi lillianduggan,

This is not the theme relating issue. Its the server relating issue. For more info visit below link
http://www.wpbeginner.com/wp-tutorials/how-to-fix-the-internal-server-error-in-wordpress/
https://www.prestashop.com/blog/en/the-500-internal-server-error-explained-solved/

Thank you!