From: 7stud -- <bbxx789_05ss@...>
Date: 2011-05-18T03:49:12+09:00
Subject: Re: File.open options hash "mode" as int

Well, the docs say this:

===
IO.open(fd, mode_string="r" [, opt] ) → io
IO.open(fd, mode_string="r" [, opt] ) {|io| block } → obj

Document-method: IO::open

With no associated block, open is a synonym for IO.new.
===

===
IO.new(fd [, mode] [, opt]) → io

Returns a new IO object (a stream) for the given IO object or integer 
file descriptor and mode string. See also IO.sysopen and IO.for_fd.
Parameters
fd:  numeric file descriptor
mode:  file mode. a string or an integer
opt:  hash for specifying mode by name.
===

The last line there seems to be why you are getting the error.

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