We are receiving a 500 error on the post.php when trying to edit a custom post type. This error is preventing the rest of the page and associated javascript components from loading, therefore this error is preventing the page from loading correcting and my users cannot edit lessons on our site.
I have tried replacing the htaccess, I have tried disabling plugins. Would this be the result of not allocating enough php memory? This is a high volume, high traffic site with considerable amount of customisation.
I have spoken with our host and there are no specific php errors. I have also run a debug and can only see small deprecation errors that shouldnt be causing this issue.
I have also created a mirror version of the site on a staging server and this seems to work fine.