Can't interpret error message from applescript

Question

I've got a simple little applescript that is supposed to trash the currently playing song in iTunes (see below).
It used to work just fine.
Now i get this error message:
The track could not be deleted. iTunes got an error: some track of current playlist whose database ID of it = 3805 doesn't understand the delete message.
I have no idea what could have caused this.
Any ideas? hints? suggestions?
Best regards,
Gabriel.
--- the applescript:
-- Original is from http://www.dougscripts.com/itunes/
-- Modified by me, GZ, 2006
-- Deletes currently played track from the current playlist and from the library.
-- Also, moves the file to the Trash.
-- Finally, starts playing the next track.
-- Displays info message very briefly if iTunes is front window.
-- Doesn't do anything, if no track is playing.
-- Put this script into ~/Library/iTunes/Scripts.
-- Optionally, assign keyboard shortcut with:
-- System Preferences -> Keyboard -> Keyboard Shortcuts -> "+" at bottom of list
-- then select iTunes, type the name of this script exactly as it appears in iTunes' Script menu,
-- then type the key combo for it.
global addenda
set addenda to ""
tell application "iTunes"
if player state is not playing then
set addenda to "No track is playing."
else
set ofi to fixed indexing
set fixed indexing to true
try
set dbid to database ID of current track
set floc to (get location of current track)
-- goto next track before deleting current track
next track
-- set trackn to (get track of current playlist whose database ID is dbid)
-- display dialog "trackn = " & (trackn as string) buttons {"OK"} default button 1
delete (some track of current playlist whose database ID is dbid)
delete (some track of library playlist 1 whose database ID is dbid)
set addenda to "removed"
if floc is not missing value then
set my addenda to "trashed"
my deletethefile(floc)
end if
on error errmesg
set addenda to "The track could not be deleted." & return & errmesg
end try
set fixed indexing to ofi
end if
-- if frontmost then
if addenda = "removed" or addenda = "trashed" then
set showtime to 2
else
set showtime to 5
end if
if addenda = "removed" or addenda = "trashed" then
display dialog "Done. The track has been " & addenda & "." buttons {"Thanks"} default button 1 with icon 1 giving up after showtime
else
display dialog addenda buttons {"OK"} default button 1 with icon 1 giving up after showtime
do shell script "logger -i -t TrashCurrentTrack " & quoted form of addenda
end if
end tell
to deletethefile(floc)
try
tell application "Finder" to delete floc
on error
set addenda to "Done. However, the file could not be moved to the Trash."
try
tell application "Finder" to open container of floc
end try
end try
end deletethefile

Answer 1

delete (some track of current playlist whose
database ID is dbid)
If iTunes is NOT playing , current playlist has no
i did check for iTunes not playing right at the beginning of my script.
However, i think it must have something to do with the playlist that is currently on. If the track is selected in the "recently added" playlist or in "library" then i get the error essage. If it is selected in the playlist "podcasts", everything is fine.
I also did this in my script,
return (some track of library playlist 1 whose database ID is dbid)
and this does actually exhibit a problem, because i get as output "" !
How is that?
Best regards,
Gabriel.