How to remove app from SharePoint 2013/2016
 I have installed an SharePoint App for creating surveys but when try to uninstall / remove it from the site it shows exception message " sorry we couldn't remove the app ".   Solution:  I have used following Power-Shell commands to install/remove app successfully    $instances = Get-SPAppInstance -Web <URL>   $instance = $instances | where {$_.Title -eq '<app_title>'}     Uninstall-SPAppInstance -Identity $instance