Columns UI
In your case, the error means you don't have the artwork panel component installed, not that you don't currently have it in your present interface. If you had all the requisite panel components, it would've been possible to load both the interface layout and the column setup, or either. Neither the FCS nor the FCL attaches the dependent components. If you don't care about the layout, just export the columns playlist script to FCL. Got it! Thanks for that. My confusion was that I mixed up the foo_uie_albumart.dll component and the "Artwork View" that's built into columns UI. I had removed the component and I guess then it complains. Actually even saving the FCL wasn't possible anymore because the orphaned entry was still in the splitter. Well, maybe if the "component missing" error were a bit more explicit as to what is missing that might be some help. One thing I notice as absolute beginner, and please take this in the kindest way, that the terminology used is a bit confusing or even overwhelming. Partially I am sure because columns UI is (luckily) evolving. For example, it took me a long time to figure out that "NG playlist" has anything to do with columns UI. It's a simple statement like "NG playlist is the new version of the playlist panel in columns UI" that I could not find in the basic documentation/wiki/faq. Sure, I found it eventually hidden away in some thread here, not until after some head spinning. And btw, what does NG stand for anyhow New Generation???
foobar2000 v0.9.6.2, columns UI 0.3.6.4, OS X 10.5.6, wine 1.0.1