Invalid operands 'Nil' and 'String' in operator '+'.

[ghost]

res://addons/ez_sound/ez_sound.gd:64 - at function: play_sfx

Even though I have setup the sounds folder and assigned its dir,
dir = ProjectSettings.get_setting(USER_SETTING_PATH, null) always returns null.

Every time I also restart godot the dir gets wiped and I have to reassign it.

I managed to get it working by just replacing
dir = ProjectSettings.get_setting(USER_SETTING_PATH, null) with
dir = "res://sounds/" (/sounds being my folder)