This is a server issue and not a theme issue. It can happen because your PHP version or/and your PHP limits are lower than Wordpress and modern themes require. For more info please carefully read this article WordPress and Kalium Server Requirements, there you can find a sample email that you can send to your hosting provider too.
whenever I install the Demo Content error 502 appears
Hi Frankpkos,
This is a server issue and not a theme issue. It can happen because your PHP version or/and your PHP limits are lower than Wordpress and modern themes require. For more info please carefully read this article WordPress and Kalium Server Requirements, there you can find a sample email that you can send to your hosting provider too.
Thanks!