On my 10.8 mac auval validates, but when trying the plugin on my 10.6.8 mac mini I get the next error:
aufx EMpT ERSY - Empty Room Systems: EMpTy250
2013-02-17 22:29:40.492 auvaltool[421:a07] Error loading /Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250: dlopen(/Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250, 262): Library not loaded: /System/Library/Frameworks/CoreText.framework/Versions/A/CoreText
Referenced from: /Users/harriemunnik/Library/Audio/Plug-Ins/Components/EMpTy250.component/Contents/MacOS/EMpTy250
Reason: image not found
Cannot open component: -50
Looks like I have to add Coretext.framework. I tried that but that did not help. Any other ideas?