RuBBS - Unknown Error

Sorry, I cannot understand cause of this error.


File read error
./rubbs.rb:252:in `open'
./rubbs.rb:252:in `transaction'
./rubbs.rb:518:in `initialize'
./lock.rb:36:in `lock'
./rubbs.rb:515:in `initialize'
usoyabbs.cgi:3:in `new'
usoyabbs.cgi:3