Failed to load Resource - Sound

Hello everyone,

Can anybody tell me what this Error means? Everytime I start a dialog in my game this warning shows up in the log viewer:
[Flash] dialog.core.Util#sound(47): Failed to load Resource:
I tried to find this sound but I couldn't.

Thanks in advance

If you go through the settings in your dialog style, you're probably referencing a sound by name that doesn't exist.