So you are saying if you copy and paste the following shortcode on a post or page, you get an “Internal Server Error”?
[asp_product id=”123″]
Can you please ask your hosting provider to read the error log file of the server and tell you what the actual error reads so we can see what it is? What version of PHP is your hosting provider using on your site? If your PHP version is too old on this server then you will have some issues.