I got this error while using the forest theme, and I looked into it and there might be a little typo in the config.ini file of the forest theme.
So basically the problem is that the volume module doesn't even exist in the modules.ini folder so if you are facing the same issue just change the volume part in the config.ini folder.
After I changed it to the pulseaudio if I am not wrong u can also change it to the alsa module:
modules-right = battery network sep pulseaudio brightness sep sysmenu
I got this error while using the forest theme, and I looked into it and there might be a little typo in the config.ini file of the forest theme. So basically the problem is that the volume module doesn't even exist in the modules.ini folder so if you are facing the same issue just change the volume part in the config.ini folder.
Before:
modules-right = battery network sep volume brightness sep sysmenu
After I changed it to the pulseaudio if I am not wrong u can also change it to the alsa module:
modules-right = battery network sep pulseaudio brightness sep sysmenu