Please help explain the error "Can't make «script» into type Unicode text"

Question

i am writing an applescript for my eyetv installation that handles recorded shows. i have posted in their forums, without reply, so thought maybe i could get some understanding of the technicalities of the fault to try to fix myself!!
i have a sub-routine:
to deleteeyetvrecording(theRecordingID)
set theScriptLibrary to load script file "Macintosh HD:Library:Scripts:ScriptLibraryv1.scpt"
tell application "EyeTV"
theScriptLibrary's log_event("RecordingDone", "Deleting EyeTV recording: " & (get title of theRecordingID), 2)
try
delete theRecordingID
on error theErrorMessage number theErrorNumber from theErrorObject
theScriptLibrary's log_event("RecordingDone", "deleteeyetvrecording: " & theErrorNumber & ": " & theErrorMessage & ". Object: " & theErrorObject, 2)
end try
end tell
end deleteeyetvrecording
even though the line above the error works fine and retrieves the Title property of the eyetv recording, the delete command on the next line outputs to the log file:
Sunday, October 26, 2008 09:50:51 [ 1 ] Error deleting file (4/4): -1700: Can’t make «script» into type Unicode text.
what does this error mean? what syntax changes are needed?
note this sub-routine worked in v1 of my script - i only copy and pasted it to the v2 script! go figure!
regards
jingo_man

Answer 1

Hello
Without knowing what theRecordingID is, how deleteeyetvrecording() is called and what the actual code of log_event() is, I can only guess.
The said error log is most likely not written by the code in the try block you provided, which should throw error by itself when theErrorObject cannot be coerced to string. I'd guess you have an enclosing try block where you call deleteeyetvrecording() and the said error log comes from there.
As far as I can tell, you should not assume that you can always coerce theErroObject (that is obtained from 'from' parameter of 'on error' statement) to text.
Too little information to go any further.
H