he probado esto:
https://colorlib.com/wp/forums/topic/errog-with-plugin-page-is-gone/
Replace in:
class-tgm-plugin-activation.php
The line 1927 with the original one:
if ( ! function_exists('tgmpa') ) {
y tampoco me funciona, dando el error
Fatal error: Cannot redeclare tgmpa_load_bulk_installer() (previously declared in pornocheff.com/web/htdocs/wp-content/plugins/wp-show-posts-pro/inc/class-tgm-plugin-activation.php:3154) in pornocheff.com/web/htdocs/wp-content/themes/ilutube/inc/admin/class-tgm-plugin-activation.php on line 2218