Fatal error: Uncaught Error: Class 'WP_Upgrader' not found in C:\HostingSpaces\gip\test.globalitpoint.com\wwwroot\wordpress\wp-admin\includes\class-plugin-upgrader.php:21 Stack trace: #0 {main} thrown in C:\HostingSpaces\gip\test.globalitpoint.com\wwwroot\wordpress\wp-admin\includes\class-plugin-upgrader.php on line 21