Ruby syntax error parsing args

gistfile1.rb

options = {}
opts = OptionParser.new do |opts|

  opts.banner = 'Usage: create_env [-f] [-e (build|run)] [-d (mysql|postgres|mssql)] <environment name>'

  opts.on_tail("-h", "--help", "Show this message") do
    puts STDERR.opts
    exit
  end

  opts.on('-f','--fixtures','Install fixtures') do |f|
    options[:fixtures] = f
  end

  opts.on('-e','--env ENVIRONMENT',[:build,:run],'Environment type (build|run) [default: run]') do |e|
    options[:environment] = e
  end

  opts.on('-d','--database DATABASE',[:mysql,:postgres,:mssql],'Database backend (mysql|postgres|mssql)') do |db|
    options[:database] = db
  end

end

## Validation

begin opts.parse! ARGV
rescue *[OptionParser::InvalidOption,OptionParser::InvalidArgument] => e
  STDERR.puts e
  STDERR.puts opts
  exit 1
end

if ARGV.length == 0
  STDERR.puts 'You must specify an environment name'.red
  exit 1
elsif ARGV.length != 1
  STDERR.puts ('Unknown trailing arguments: %s' %[ARGV.drop(1)]).red
  exit 1
end