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


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