SeqMan NGen utilizes two assemblers, XNG and SNG, with different capabilities and scripting languages. Therefore, it is essential to match the correct assembler with the type of assembly project to be done. See XNG and SNG Assemblers for usage recommendations.
To specify which assembler to use to run your script, type xng or sng followed by the path and script file name after the command prompt. Alternatively, add either the #!/usr/bin/xng or #!/usr/bin/sng command as first line of the script and execute through the command line.