At the top of your script, write something like:
 Code:
;Script Options
Break On
Dim $RC
$RC = SetOption("Explicit","On")
$RC = SetOption("NoMacrosInStrings","On") ;I presume this line will solve your problem
$RC = SetOption("NoVarsInStrings","On")

;Code
SETM "ADSKFLEX_LICENSE_FILE=@midland"