GK RESERVATION - BOOKING ERROR

Hi everyone,
i have a problem with the GK RESERVATION booking module on my Joomla 3 Quark template.
On the attachment i put the screen shot of the error, when i choose a day etc and click on make reservation.
It doesn't work well, and send me back the error.
Can anybody help me please?
Thanks in advance.

Hi

Please try update the module with a version You will find in rest_files package for this template.

Thanks for the reply. I try it, reinstall and install again, but it doesn't work yet.

Hi

Please send me an access to joomla panel and ftp. I'll see what can be wrong.