Hi,
I think you have a PHP fatal error in your page.
The easier will be to check your PHP error log or to set the "error reporting level" to "maximum" in your Joomla global configuration.
Thanks to that, you should be able to see the error message and so, help us to find a fix for your issue.
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.