Upgrade Snapcenter failed : SnapCenter Plug-in for NAS File Services is not supported

Hello ,

i'm trying to upgrade Snapcenter Server from 4.1.1 to 4.3.1 but got message "SnapCenter Plug-in for NAS File Services is not supported with this version of SnapCenter " . how to uninstall this plug-in ? 

There is a Linux server , probably configured in previous version  but not used .

I cannot find nothing in Snapcenter GUI .