Hi,
It looks like you have a PHP Fatal error in your pack listing page ; but I don't reproduce the issue in my local website or in the demo website.
Can you please check your PHP Error log or set the "error reporting level" to "maximum" in your Joomla global configuration in order to see the error message ? (which will be display at the bottom of the page).
About the serial ; it should be in a pack but if you don't have some, it could explain the issue.
I'll made a patch in order to fix that.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.