Error when starting Galmon

[G8YTZ]

My Galmon instance has been working perfectly for several years running on a Pi4 with a NEO-M9N receiver. I updated Docker and Portainer

"Error response from daemon: error gathering device information while adding custom device "/dev/ttyACM0": no such file or directory."

pi@GeoMon:~ $ dmesg | grep tty
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_headphones=0 snd_bcm2835.enable_headphones=1 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_hdmi=0 smsc95xx.macaddr=E4:5F:01:D2:13:9F vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 console=tty1 root=PARTUUID=79abd7bc-02 rootfstype=ext4 fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles
[ 0.000388] printk: console [tty1] enabled
[ 1.605519] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 36, base_baud = 0) is a PL011 rev2
[ 3.595436] systemd[1]: Created slice system-getty.slice.

It appears that the receiver is not being detected (I tried ttyAMA0) and Galmon does start.

Bert, any ideas? Could it be that my receiver has expired?