Error on local instalation

UI have Xampp instaled on my pc (version 8.02) and I instaled Gridbox , but when I try to go to the Themes part I get " An error has occurred. 0 mysqli_query(): Argument #2 ($query) cannot be empty "

Any ideas what to do? I was getting also another error before but after replacing the brackets in some lines of code , it was ok.

Hello,

Thank you for contacting us!

Unfortunately, this error is not enough.
We need access to the site to try to figure out the cause of the problem and fix it

Best Regards,
Vyacheslav, Balbooa Support Team

I understand but its a local installation. So I wanted to check if you could guide me on hat to check . It seems strange that the error occurs when I click on the themes tab of Gridbox.

Let us know if the error repeats on the real site.
Then we can try to figure out the reason.

Regards,
Vyacheslav, Balbooa.com