[vassalengine] Error message when loading Combat Commander module 1.6 in VASSAL 3.0.5

[Pierre Miranda]

I get a strange error message when loading the module:

cannot create file VASSAL.build.module.PlaySoundButton.class in [...]
(module's path)

Unable to load VASSAL.build.module.PlaySoundButton

"VASSAL/build/module/PlaySoundButton" not found in [...] (module's path)