Plug-In

Hi Everyone,

I m using the SFTP Plug-in to send a file but I ma getting the following error.

This plug-in [sftp] is not registered to access secured values for the given external system key [ExternalSystem]. Check the external systems plug-ins list in the Administration Console. (APNX-1-4229-003)

Here I have added the external system in third-party credentials and added this plugin in the list also but still same error.

Which is causing this error? 

thanks in advance.