Host is down once data uploaded

Hello Everyone, I have hosted my shiny app in shinyapps.io under paid subscription. One of my client started to use app from today morning and he got error (Disconnected from Server). I have checked log file and found,

2025-04-08T08:32:25.836731+00:00 shinyapps[13811677]: System has not been booted with systemd as init system (PID 1). Can't operate.
2025-04-08T08:32:25.841014+00:00 shinyapps[13811677]: Failed to connect to bus: Host is down
2025-04-08T08:32:25.845198+00:00 shinyapps[13811677]: Warning in system("timedatectl", intern = TRUE) :
2025-04-08T08:32:25.849337+00:00 shinyapps[13811677]: running command 'timedatectl' had status 1

As, I don't have client data with me, I didn't understand from log file what is the reason behind this error. Photos are attached in below. Can anyone help me to dig into. Thanks in advance.

Kind regards
Shafiul