puppetdoc --mode rdoc --trace
/usr/lib/ruby/1.8/rdoc/dot/dot.rb:28: warning: already initialized constant NODE_OPTS
/usr/lib/ruby/1.8/rdoc/dot/dot.rb:46: warning: already initialized constant EDGE_OPTS
/usr/lib/ruby/1.8/rdoc/dot/dot.rb:76: warning: already initialized constant GRAPH_OPTS
/usr/lib/ruby/1.8/rdoc/rdoc.rb:110:in `join'
/usr/lib/ruby/1.8/rdoc/rdoc.rb:110:in `setup_output_dir'
/usr/lib/ruby/1.8/rdoc/rdoc.rb:243:in `document'
/usr/lib/ruby/site_ruby/1.8/puppet/util/rdoc.rb:30:in `rdoc'
/usr/bin/puppetdoc:202
Could not generate documentation: can't convert nil into String