Download Public PBase Galleries with Groovy

pbase.groovy

@Grab('net.sourceforge.nekohtml:nekohtml:1.9.16')

def outFolder = new File("/folder/to/download/to")
outFolder.mkdirs()

def url = 'http://www.pbase.com/USERNAME/GALLERYNAME&page=all'

def parser = new org.cyberneko.html.parsers.SAXParser()
new XmlSlurper(parser).parse(url)
    .'**'
    .findAll { it.name() == 'A' && it.@class == 'thumbnail' }*.@href*.text()
    .collect { page ->
        new XmlSlurper(parser).parse(page).'**'.find { it.name() == 'IMG' && it.@class == 'display' }.@src.text()
    }
    .each { address ->
        new File(outFolder, "${address.tokenize('/')[-1]}").withOutputStream { out ->
            out << new URL(address).openStream()
        }
    }

I am trying to use this script but cannot get it to work.
I edited the outFolder and url in the script.
It created the outFolder but did not seem to download anything.
Could you give me instruction on how to use it? Thanks!