Hi,
Like I told you in my last private message. The error given by Joomla indicates that the controller returned a "false" for the execute function.
I can't reproduce your problem in my local website (Joomla 3 with Joomla SEF). So the best is to put some debug trace in the HikaMarket controller itself in order to know why it returns "false".
For this purpose, the best is to have an FTP access, I would be able to modify temporally the HikaMarket controller file, retrieve the debug data and restore the original 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.