JOURNALCTL ERROR - Invalid value for IMPORT (invalid substitution type)

On Ubuntu server 22.04 I’m geting next errors:

Jul 29 06:23:54 can1 systemd-udevd[384]: /etc/udev/rules.d/99-digitalocean-automount.rules:11 Invalid value "/bin/sh -c 'echo TMP_MOUNT_DIR=$(mktemp -d -p /mnt .do-first-mount-XXXXXXXXX)'" for IMPORT (char 32: invalid substitution type), ignoring.
Jul 29 06:23:54 can1 systemd-udevd[384]: /etc/udev/rules.d/99-digitalocean-automount.rules:12 Invalid value "/bin/sh -c 'echo TMP_SCRIPT=$(mktemp -t .do-first-mount-XXXXXXXXX.sh)'" for IMPORT (char 29: invalid substitution type), ignoring.

I checked what is written in /etc/udev/rules.d/99-digitalocean-automount.rules and I have found next lines (beside others):

# Create a temporary mountpoint and temporary location for the first-mount script.
IMPORT{program}="/bin/sh -c 'echo TMP_MOUNT_DIR=$(mktemp -d -p /mnt .do-first-mount-XXXXXXXXX)'"
IMPORT{program}="/bin/sh -c 'echo TMP_SCRIPT=$(mktemp -t .do-first-mount-XXXXXXXXX.sh)'"

What is wrong?