Hi,
Please do not delete it, restore a backup, re-install the complete site or I don't know.
I have re-installed the plugin in your website.
The plugin would be correctly include in HikaShop 2.1.0 so you would not have such problem with the new version of HikaShop.
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.