Hi,
Well, in your PHP error log ; it's related to your web hosting, not to HikaShop or Joomla.
Otherwise you can change the "error reporting level" to "maxium" in your Joomla global configuration (tab "server"), it should display the errors in the page instead of log them in the log file.
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.