Error with automator & soundtrack pro

Question

I'm trying to make a workflow that will take a finder selection of apple loops (including a folder) and open them with soundtrack pro and save as... AIFF files. I'm getting an error on the last step no matter what I do. I originally thought the aiff file options had to match the .caf attributes (i.e. same sample rate, bit depth, etc.) but fixing that doesn't seem to help.
Here's the error log:
2009-01-27 10:59:12 -0500: The action “Get Selected Finder Items” was not supplied with the required data.
2009-01-27 10:59:12 -0500: Get Selected Finder Items completed
2009-01-27 10:59:13 -0500: Open Finder Items completed
2009-01-27 10:59:13 -0500: (null) failed
An error occurred while converting \U201Ccom.apple.applescript.alias-object\U201D to \U201Ccom.apple.soundtrackpro.document.audiofile-object\U201D.
So here's what's weird: I keep getting this “Get Selected Finder Items” was not supplied with the required data," but the results shows the file I have selected in the file, and subsequent steps in the workflow show the selected file being passed correctly… so I'm not really sure what the problem is. I've written other workflows with the GSFI object and haven't seen this error before, so if anyone has an idea, I'd love to hear it.
Thanks much.

Answer 1

and the applescript alias of the file I'm working with is:
{alias "Macintosh HD:Library:Audio:Apple Loops:Apple:Apple Loops for Soundtrack Pro:Apple Loops:Andy Boretto:beepsandclicks1.caf"}
One other note - just to double-check, I deleted the "open w/ soundtrack, save as" actions and replaced them with "copy file, rename file" and the workflow completes without a problem– BUT I'm still getting the "“Get Selected Finder Items” was not supplied with the required data" error, so I'm still not sure what's going on there.