Apple

Here's the offending line of code ...

tell application "System Events"

tell process "Mail"

. . .

set value of text field 1 of sheet 1 of sheet 1 of window 1 to tempFileName --<< error here

keystroke "d" using {command down} -- sets save location to Desktop

keystroke return -- click button "Save"

end tell

The line "error here" decodes as:

the file name field

of the print to pdf sheet

of the print sheet

of the message window

Immediately after a system restart, the "error here" line errors with -1719

"System Events got an error: Can't get sheet 1 of sheet 1

of window 1 of process "Mail". Invalid index."