You will probably need to up your memory limit or disable other plugins.
The theme is heavy in plugins – if you have added more and your memory_limit is low you will have problems
I just lost a day and a half over HTTP 500 Error
I had added jetpack plugin – all was fine working off localhost on my computer – when I loaded the site up to the live VPS server and went to connect jetpack to wordpress.com account – instant HTTP 500 Error.
Initially I thought I had tracked it down to a jetpack / woocommerce booster clash. I turned woocommerce booster off and I could connect jetpack without the whole site falling over. Also – the moment I connected jetpack and the site going down – if I disconnected jetpack from my wordpress.com account – the site came back – so I thought it a jetpack problem or woocommerce booster problem.
My VPS has a lot of resources but memory_limit was (already) set to 256
I tried the wp-config.php of
define( ‘WP_MEMORY_LIMIT’, ‘512M’ );
define( ‘WP_MAX_MEMORY_LIMIT’, ‘512M’ );
but that method did not work for me
More testing and shuffling of plugins – eventually realised it was a cumulative issue of plugins hitting my memory. Jetpack and booster are big so they were tipping the issue. I turned them on first – all ok – then turned on the rest one at a time until I got the http error 500 again – which was youtube-embed-plus (last on the plugin list). All off – activated Jetpack, woocommerce booster and youtube-embed-plus then connected Jetpack successfully – finally realised it was just too many plugins for the allocated memory.
I eventually tried the php.ini method to increase memory_limit to 512 and it worked – all plugins on and jetpack connected – no 500 error.
I posted full debug lists at
https://wordpress.org/support/topic/jetpack-and-intermittent-http-500-errors/
.