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puppetdoc --mode rdoc
/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
Could not generate documentation: can't convert nil into String