[Rails] no method "each" method for nilclass

Dir.glob("data-hold/pages/*.html").each do |fname|
meta_info = File.basename(fname, '.html').split('--')
page = Nokogiri::HTML(open(fname))

page.css("#{TABLE_DIV_ID} tr")[1..-2].each do |tr|
data_tds = tr.css(td).map{ |td|
td.text.gsub(/[$,](?=\d)/, '').gsub(/\302\240|\s/, '').strip
}

error in each do method in first line of both blocks

block irb binding in second block first line

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