Zara 1.8.0 Error 502 Bad Gateway Search

Hello

I installed Osclass 8 and the Zara Theme 1.8.0 to test it out so I can see everything.

But the Zara theme has a problem.

When I search for something like country, location, category, company, or private offer, I immediately get a 502 Bad Gateway error.

But I can search everything normally in the default theme Sigma. Do you have a solution?

Thanks
Best regards

502 is probably not osclass related, try to enable error logs to see some more details, but as said 502 sounds like other issue.
Maybe security, mod_rewrite or things like that, as form is submitted with many fields.