Compiler complains that $STDERR_MERGED is undefined global variable

[david@…]

The helps for Run indicate a new standard_i/o_flag option described below:

8 ($STDERR_MERGED) = Provides the same handle for STDOUT and STDERR. Implies both $STDOUT_CHILD and $STDERR_CHILD.

Generates the following when I compile:
WARNING: $STDERR_MERGED: possibly used before declaration.
$DevConCheck = Run( "DevCon.exe help", @ScriptDir, @SW_HIDE, $STDERR_MERGED)

ERROR: $STDERR_MERGED: undeclared global variable.

$DevConCheck = Run( "DevCon.exe help", @ScriptDir, @SW_HIDE, $STDERR_MERGED)

Script.au3 - 1 error(s), 1 warning(s)

Script is below:
#Region ; Directives created by AutoIt3Wrapper_GUI
#AutoIt3Wrapper_Change2CUI=y
#EndRegion ; Directives created by AutoIt3Wrapper_GUI

$DevConCheck = Run( "DevCon.exe help", @ScriptDir, @SW_HIDE, $STDERR_MERGED)

If $DevConCheck = 0 Then

ConsoleWriteError( "DevCon.Exe not found in path." & @CRLF )
Exit(1)

Else

ConsoleWrite( "DevCon.Exe found in path." & @CRLF )

EndIf

[david@…]

Close bug.

I did not realize one had to add #include<Constants.au3>. It was referenced in the help, but did not realize it needed to specified. I realized my mistake as soon as I tried to use the other constants as well.

my apologies.