Hello, recently, I started having ‘EventStream Connection Error’ when trying to export to PDF or Epub.
I found this on the server LOG
[Thu Jun 29 11:35:59.140675 2023] [php:error] [pid 9515] [client 186.15.239.78:15395] PHP Fatal error: Uncaught Error: Undefined constant “FS_CHMOD_FILE” in /var/www/pem/libros/wp-admin/includes/class-wp-filesystem-direct.php:164\nStack trace:\n#0 /var/www/pem/libros/wp-admin/includes/class-wp-filesystem-direct.php(86): WP_Filesystem_Direct->chmod()\n#1 /var/www/pem/libros/wp-content/plugins/pressbooks/inc/utility/namespace.php(1229): WP_Filesystem_Direct->put_contents()\n#2 /var/www/pem/libros/wp-content/plugins/pressbooks/inc/modules/export/prince/class-pdf.php(111): Pressbooks\Utility\put_contents()\n#3 /var/www/pem/libros/wp-content/plugins/pressbooks/inc/modules/export/class-export.php(779): Pressbooks\Modules\Export\Prince\Pdf->convert()\n#4 /var/www/pem/libros/wp-content/plugins/pressbooks/inc/class-eventstreams.php(71): Pressbooks\Modules\Export\Export::exportGenerator()\n#5 /var/www/pem/libros/wp-content/plugins/pressbooks/inc/class-eventstreams.php(241): Pressbooks\EventStreams->emit()\n#6 /var/www/pem/libros/wp-includes/class-wp-hook.php(308): Pressbooks\EventStreams->exportBook()\n#7 /var/www/pem/libros/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()\n#8 /var/www/pem/libros/wp-includes/plugin.php(517): WP_Hook->do_action()\n#9 /var/www/pem/libros/wp-admin/admin-ajax.php(188): do_action()\n#10 {main}\n thrown in /var/www/pem/libros/wp-admin/includes/class-wp-filesystem-direct.php on line 164, referer:
This seems to be the error:
Error: Undefined constant "FS_CHMOD_FILE" in /var/www/pem/libros/wp-admin/includes/class-wp-filesystem-direct.php
Do you know how this can be addressed? Do you think this can be due to be running a self-hosted instance of pressbooks on PHP8?