Fatal error: Cannot declare class WP_Ability, because the name is already in use in G:\FerozoWebHosting\cgcecba.com.ar\public_html\wp-includes\abilities-api\class-wp-ability.php on line 21

Fatal error: Uncaught Error: Call to a member function set() on null in G:\FerozoWebHosting\cgcecba.com.ar\public_html\wp-includes\l10n.php:857
Stack trace:
#0 G:\FerozoWebHosting\cgcecba.com.ar\public_html\wp-includes\l10n.php(960): load_textdomain('default', 'G:\\FerozoWebHos...', 'es_ES')
#1 G:\FerozoWebHosting\cgcecba.com.ar\public_html\wp-includes\class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler->handle()
#3 {main}
  thrown in G:\FerozoWebHosting\cgcecba.com.ar\public_html\wp-includes\l10n.php on line 857