It looks like the Device::SerialPort->new("/dev/ttyS0"); statement isn't returning a serial port for you. You should check things like that in your code. For example:
my $port = Device::SerialPort->new("/dev/ttyS0");
die "Can't open /dev/ttyS0: $!" if ! defined $port;
Please note: Your code may not have enough permissions to open the serial port. For some versions of *nix, you may not even have a /dev/ttyS0!
When your only tool is a hammer, all problems look like your thumb.
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