Hi,
The log show warning in the emails.
We will see the source of these warning and fix them. There is no big issue with warning, it's not a fatal error.
So that does not explain your "500" error page.
Please understand that without an access to your website, we can't help you as we wanted to.
You need to reproduce the error page and see the PHP fatal error which create this error page.
You can also use another browser than IE, like Firefox, to see the real content returned by your website and not the generic "500" page.
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.