Theme Install functions.php error

I am installing a theme and keep getting an error for the wp-includes/functions.php.

This is the error:

Warning: fopen(/home/jillian/public_html/wordpress/wp-content/themes/wisebusiness_wp/style.css) [function.fopen]: failed to open stream: No such file or directory in /location…/wordpress/wp-includes/functions.php on line 4165

Warning: fread(): supplied argument is not a valid stream resource in /location…/wordpress/wp-includes/functions.php on line 4168

Warning: fclose(): supplied argument is not a valid stream resource in /location…/wordpress/wp-includes/functions.php on line 4171

Link to theme: https://www.site5.com/wp-themes/download.php?file=wisebusiness_wp.zip

Any thoughts on why this happens? Thanks for your help.