Code causes major error

I’m not sure what I’m doing wrong, but I get the following error on the page where I put the shortcode:

“Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 42 bytes) in /home/content/15/9570915/html/neverheard/wp-includes/post.php on line 680”

The site is http://www.neverheardofemaustinmusic.com

It is a scrolling site and all pages AFTER are gone when I insert the shortcode.

I’ve tried several times to work with this plugin and am about to give up on it.

https://wordpress.org/plugins/simple-download-monitor/