How Do I Fix KM Read File Error Due to Encoding Error?

I used this on a daily basis to read a htm or html file to a virable, but after updating to the newest version (9.0.5), this error occured:

MACRO ERROR  on  2020-04-03 10:22:44

This info was pulled from the KM Engine Log for the
Last Macro error that occured.

Macro: Trying
Action: Read File to Variable “sourceText”

Read File action failed to read text file with error Error Domain=NSCocoaErrorDomain Code=264 "The file “temp.html” couldn’t be opened because the text encoding of its contents can’t be determined." UserInfo={NSFilePath=/Users/xxx/Downloads/temp.html}

Log File: ~/Library/Logs/Keyboard Maestro/Engine.log

Check the file encoding of the file. The Read File action reads the file as a string, and the system determines the appropriate character encoding. Seems like the system cannot determine the encoding (maybe there are multiple different encodings in the file, some UTF8, some ISO-8859-1 Latin or something like that).

This has not changed in Keyboard Maestro 9.0.5.

I'm getting the same error while KM tries to read a file that it has previously created through an Apple script. The file is a .txt file and it can be opened and viewed in Text Edit without a problem.

This is the part of the script that writes the file:

set _output to "Macintosh HD:Users:home:Desktop:Lists:NameofList.txt"
	set _reference to open for access file _output with write permission
	write _body to _reference
	close access _reference
end try

Check the file encoding on the file.

Here is a better AppleScript to write text to file:
Tested running Keyboard Maestro 9.2 on macOS 10.14.6 (Mojave).

AppleScript to Write Text to File

property ptyScriptName : "Create & Write String to File UTF8 ASObjC"
property ptyScriptVer : "1.1"
property ptyScriptDate : "2021-02-21"
property ptyScriptAuthor : "JMichaelTX"

use AppleScript version "2.5"
use framework "Foundation"
use scripting additions

  ### --- Set Your File HFS Path Here ---
  set fileHFS to "Macintosh HD:Users:home:Desktop:Lists:NameofList.txt"
  set filePath to POSIX path of fileHFS
  set fileContents to "
This file was created by AppleScript, using ASObjC.
  set results to my writeFile(filePath, fileContents)
  return filePath
on error errMsg number errNum
  if errNum = -128 then ## User Canceled
    set errMsg to "[USER_CANCELED]"
  end if
  set scriptResults to "[ERROR] [MACRO CANCELLED] " & errMsg
  set currentApp to path to frontmost application as text
  tell application currentApp
    display notification errMsg ¬
      with title ("SCRIPT:  " & ptyScriptName & " " & ptyScriptVer) ¬
      subtitle "[ERROR] MACRO CANCELLED " sound name "glass"
  end tell
  --»  THROW ERROR ~~~~~~~
  error scriptResults
end try

on writeFile(pPosixPath, pStringToWrite)
  (*  VER: 1.1    2020-01-07
  PURPOSE:      Write String to File.  Will be created if necessary.
    • pPosixPath          ┃ text  ┃ Posix Path of File to write to
    • pStringToWrite    ┃ text  ┃ String to be written
  RETURNS:                 ┃boolean┃ true if successful; else error is thrown
  AUTHOR:  JMichaelTX
  local successfulBool
  set nsStringToWrite to current application's NSString's stringWithString:pStringToWrite
  set nsPosixPath to (current application's NSString's stringWithString:pPosixPath)'s stringByExpandingTildeInPath
  set successfulBool to nsStringToWrite's writeToFile:nsPosixPath atomically:true encoding:(current application's NSUTF8StringEncoding) |error|:(missing value)
  if (successfulBool is false) then
    error "Unable to write to file: " & pPosixPath
  end if
  return successfulBool
end writeFile
--~~~~~~~~~~~~~~~ END OF handler writeFile ~~~~~~~~~~~~~~~~~~~~~~~~~