Autoupdate fails

Hi Guys, I have a lot of sites that use the same setup and plugins, so its safe for me to use an autoupdate setting on many sites.

I have been using Easy Updates Manager for that ( https://wordpress.org/plugins/stops-core-theme-and-plugin-updates/ ) this plugin work great on everything except WPMU plugins.

Whenever there is an update for one of your plugins I get an error message >> Error: [fs_unavailable] can not get access to filesystem.

Which means I have to visit the site(s) one by one to update the WPMU plugins.

Do you know how I can fixs this? (without changing to another update manager! )

Kind Regards, Henk