gutenprint / cups

[n dhert]

There have been updates to cups and gutenprint.
I now have # pkg_info | grep guten
gutenprint-base-5.2.4 GutenPrint Printer Driver
gutenprint-cups-5.2.4 GutenPrint Printer Driver

But an # lpstat -t
shows for my printers:
        Unable to start filter "rastertogutenprint.5.1" - No such file or
directory.
Maybe I need to do a restart or stop/start of the printer queues ?
In the older cups In the webpages of http://localhost:631 There was a button
to do a restart of a printer queue,
but I don't see such a button in the new layout of the webpages...

Can I use a command line command to do a restart or stop/start of a printer
queue, or how to
solve this ?