I initially thought this was the package’s fault then toastify prints a message:
$ toastify send "Hello"
"Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken."
What to do?
I am using i3-gaps wm(originally it is xfce). Is xfce’s default notification shower thingy interfering with this or something?
SOLUTION: Just get dunst or similar notification server runnin in the background.