When you dont get permission to access something on your website then this error is known as 403 Forbidden WordPresserror. It can be caused because of incorrect file permissions or the corrupt .htaccess file. If the file is corrupted then try to fix it with any FTP manager. Sometimes, faulty or recently installed plugins can also make this error to occur. For fixing this, youll need to deactivate the plugin. In addition to this, try to deactivate the plugins one by one to the faulty one. After deactivation, check to access the website.