tableview: QuarkXpress Error -120

I write a programm with two tableviews: "dropped_files + “Errordateien”

QuarkXpress make ps-files from the filelist of the tableview “dropped_files”.

I add files from the tableview “Errordateien” to “dropped_files” but quarkxpress brings by this files the follow error: “Folder some object wasn´t found. (-120)”

What is wrong with my script?
Please help me…
Many thanks!

on clicked theObject
if name of theObject is "create" then
		set tableView to table view "dropped_files" of scroll view "dropped_files" of window "main"
		set theDataSource to data source of tableView
		set theRows to every data row of theDataSource
		set numItems to count of theRows
		repeat while numItems > 0
			tell window "main"
				set theDataRow to item 1 of theRows
				set fileName to contents of data cell of theDataRow as string
			end tell
			my exportPS(fileName)
			delete item 1 of theRows
			set theRows to every data row of theDataSource
			set numItems to count of theRows
		end repeat
		
	else if name of theObject is "AddError" then
		set tableView to table view "Errordateien" of scroll view "Errordateien" of window "main"
		set theDataSource to data source of tableView
		set theRows to every data row of theDataSource
		set numItems to count of theRows
		repeat while numItems > 0
			tell window "main"
				set theDataRow to item 1 of theRows
				set fileName to contents of data cell of theDataRow as text
				set addfile to fileName as string
			end tell
			tell data source of table view "dropped_files" of scroll view "dropped_files" of window "main"
				set newZeile to make new data row at end of data rows
				set contents of data cell of newZeile to addfile
			end tell
			delete item 1 of theRows
			set theRows to every data row of theDataSource
			set numItems to count of theRows
		end repeat
		(*
	else if name of theObject is "errorliste" then
		set deleteError to data source of table view "Errordateien" of scroll view "Errordateien" of window "main"
		delete every data row of deleteError
		*)
	end if
end clicked


on exportPS(fileName)
			tell application "QuarkXPress Passport"
			activate
			open alias fileName use doc prefs yes remap fonts ask do auto picture import ask
			tell document 1
				----------Hier werden die Bilde überprüft-----------
				--------------------------------------------------------------	
				set missList to {}
				set modList to {}
				try
					tell every picture box
						set missList to missing of every image
						set modList to modified of every image
					end tell
				end try
				if missList contains true or modList contains true then
					--if missList contains true then
					my missList()
				else
					--------------------------------------------------------------	
					--------------------------------------------------------------	
					
					my printPS(fileName)
				end if
			end tell
		end tell
	end exportPS