w2tags-0.9.67/lib/w2tags/parser.rb:218:in parse_file': undefined method <<' for nil:NilClass (NoMethodError) #1
Description
When i'm trying to convert any file by "w2tags" command, it throws:
w2tags-0.9.67/lib/w2tags/parser.rb:218:in parse_file': undefined method<<' for nil:NilClass (NoMethodError)