Notification Icon & Sound isn't working in DWM

I'm pretty sure I've done something wrong in the configuration.

```
[icons]
critical_icon=~/pictures/icons/notification-icon.png
info_icon=~/pictures/icons/notification-icon.png
warning_icon=~/pictures/icons/notification-icon.png

[main]
activate_command=
duration=3000
host=127.0.0.1
port=9797
sound_command=cmus
```