Error -10006 can't set object or data to object or data

Question

Hi
Tripped up again by a silly error, I am trying to update an item in a record list but keep getting error -10006
Code below simplified but still produces the error, all help gratefully received.
set filePath to "/Users/Ours/Documents/Text File.txt"
set recordList to every paragraph of (read filePath) -- get all records
set AppleScript's text item delimiters to ","
set (text item 1 of item 1 of recordList) to "Ninth"
message is :
tell current application
  read "/Users/Ours/Documents/Text File.txt"
  --> "First,Second,Third
Result:
error "Can’t set text item 1 of \"First,Second,Third\" to \"Ninth\"." number -10006 from text item 1 of "First,Second,Third"

Answer 1

You can't set text items directly like that. first convert the text to a list of text items, alter the list, then convert it back to text:
set filePath to "/Users/Ours/Documents/Text File.txt"
set recordList to every paragraph of (read filePath) -- get all records
set {oldTID, AppleScript's text item delimiters} to {my text item delimiters, ","}
set tempList to text items of recordList
set item 1 of tempList to "Ninth"
set recordList to tempList as text
set AppleScript's text item delimiters to oldTID