pdf-writer
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no marshal_dump is defined for class Mutex
/usr/local/lib/ruby/site_ruby/1.9.1/transaction/simple.rb:176:in dump': no marshal_dump is defined for class Mutex (TypeError) from /usr/local/lib/ruby/site_ruby/1.9.1/transaction/simple.rb:176:in
start_transaction'
from /usr/local/lib/ruby/site_ruby/1.9.1/transaction/simple/group.rb:102:in block in start_transaction' from /usr/local/lib/ruby/site_ruby/1.9.1/transaction/simple/group.rb:102:in
each'
from /usr/local/lib/ruby/site_ruby/1.9.1/transaction/simple/group.rb:102:in start_transaction' from /usr/local/lib/ruby/site_ruby/1.9.1/pdf/simpletable.rb:396:in
render_on'