Error after activate

Hi

Thanks for your work on the plugin. I’m not able to activate it after downloading from wordpress itself. I think the language below will not get in the way of understanding what it might be. I’m no expert, but can I do anything to fix this?

Detalhes do erro
================
Um erro do tipo E_ERROR foi causado na linha 46 do arquivo(An error of type E_ERROR was caused on line 46 of the file)
/home/idmwebne/public_html/wp-content/plugins/diagnoseo/includes/class-diagnoseo-plugindetector.php. Mensagem de erro: Uncaught TypeError: method_exists(): Argument #1 ($object_or_class) must be of type object|string, null given in /home/idmwebne/public_html/wp-content/plugins/diagnoseo/includes/class-diagnoseo-plugindetector.php:46
Stack trace:
#0 /home/idmwebne/public_html/wp-content/plugins/diagnoseo/includes/class-diagnoseo-plugindetector.php(46): method_exists()
#1 /home/idmwebne/public_html/wp-content/plugins/diagnoseo/includes/class-diagnoseo-plugindetector.php(28): Diagnoseo_PluginDetector->detect_seo_plugins()
#2 /home/idmwebne/public_html/wp-content/plugins/diagnoseo/includes/admin-actions.php(35): Diagnoseo_PluginDetector->__construct()
#3 /home/idmwebne/public_html/wp-includes/class-wp-hook.php(307): diagnoseo_detect_seo_plugins()
#4 /home/idmwebne/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()
#5 /home/idmwebne/public_html/wp-includes/plugin.php(474): WP_Hook->do_action()
#6 /home/idmwebne/public_html/wp-settings.php(450): do_action()
#7 /home/idmwebne/public_html/wp-config.php(100): require_once('/home/idmwebne/...')
#8 /home/idmwebne/public_html/wp-load.php(50): require_once('/home/idmwebne/...')
#9 /home/idmwebne/public_html/wp-admin/admin.php(34): require_once('/home/idmwebne/...')
#10 /home/idmwebne/public_html/wp-admin/plugins.php(10): require_once('/home/idmwebne/...')
#11 {main}
  thrown