bad use of syntactic keyword

[Gottfried]

Hi,

after adding: "service redshift" to my config.scm

running

sudo guix system configure /etc/config.scm

it says:

guix system: Fehler: _: bad use of '_' syntactic keyword

german Fehler = mistake

I don’t know where is my mistake.
................................................................................
here my config.scm:

;; This is an operating system configuration generated
;; by the graphical installer.

(use-modules (gnu))
(use-package-modules cups scanner)
(use-service-modules cups desktop networking ssh xorg virtualization)

(operating-system
  (locale "de_DE.utf8")
  (timezone "Europe/Berlin")
  (keyboard-layout (keyboard-layout "de"))
  (host-name "Tuxedo")
  (users (cons* (user-account
                  (name "gfp")
                  (comment "Gfp")
                  (group "users")
                  (home-directory "/home/gfp")
                  (supplementary-groups
                    '("wheel" "netdev" "audio" "video" "libvirt")))
                %base-user-accounts))
  (packages
    (append
      (list (specification->package "nss-certs"))                  
      %base-packages))
  (services
    (append
      (list (service mate-desktop-service-type)
            (service enlightenment-desktop-service-type)
                        (service cups-service-type
                                (cups-configuration
                                        (web-interface? #t)
                                        (extensions (list cups-filters 
hplip))))                        
                        (service openssh-service-type)
            (service tor-service-type)
            (set-xorg-configuration
              (xorg-configuration
               (keyboard-layout keyboard-layout)))
            (service libvirt-service-type
                     (libvirt-configuration
                      (unix-sock-group "libvirt")
                      (tls-port "16555")))
            (service virtlog-service-type
                     (virtlog-configuration
                      (max-clients 1000)))
            (service home-redshift-service-type
                     (home-redshift-configuration
                      (location-provider 'manual)
                      (latitude 52.5)        ;northern hemisphere
                      (longitude 13.5)))     ;Berlin
            (modify-services %desktop-services
              (guix-service-type
                   config => (guix-configuration
                     (inherit config)
                     (extra-options (list "--gc-keep-derivations=yes" 
"--gc-keep-outputs=yes")))))
            (sane-service-type _ => sane-backends))))

  (bootloader
    (bootloader-configuration
      (bootloader grub-efi-bootloader)
      (targets (list "/boot/efi"))
      (keyboard-layout keyboard-layout)))
  (swap-devices
   (list (swap-space
          (target (uuid "51d5cd20-4513-4a02-9e35-df4338eccaa0")))))
  (file-systems
    (cons* (file-system
             (mount-point "/boot/efi")
             (device (uuid "BB77-FE3B" 'fat32))
             (type "vfat"))
           (file-system
             (mount-point "/")
             (device
               (uuid "4fb0ed7c-61ab-45eb-be0b-ff527b320e6d"
                     'ext4))
             (type "ext4"))
           %base-file-systems))
  (initrd-modules (cons "virtio_scsi"    ; Needed to find the disk
                        %base-initrd-modules)))

............................................................................ 

Thanks for help

Kind regards

Gottfried

OpenPGP_0x61FAF349C9FB7F94.asc
Description: OpenPGP public key

OpenPGP_signature
Description: OpenPGP digital signature