I just installed the rbcw version of Ruby on my box, including cygwin.
Simple programs run fine.  However, when I run any Tk related scripts,
they choke.  For example, when I run the simplest Tk script, tkhello.rb,
I get the following:

----------------------------------
C:\Ruby>ruby sample\tkhello.rb
/cygdrive/c/RUBY/lib/tcltklib.rb:7:in `+': failed to convert nil into
String (TypeError)
        from /cygdrive/c/RUBY/lib/tcltklib.rb:7
        from /cygdrive/c/RUBY/lib/tk.rb:7:in `require'
        from /cygdrive/c/RUBY/lib/tk.rb:7
        from sample\tkhello.rb:1:in `require'
        from sample\tkhello.rb:1
--------------------------------------

Any idea what's causing the problem and how I fix it?  The problem isn't
that I don't have Tk on my box; I can run Tk just fine from Python.  Any
suggestions would be greatly appreciated.

Thanks,
Anders Schneiderman
The National Journal


P.S.  This is what's in tkhello.rb:


require "tk"

TkButton.new(nil,
	     'text' => 'hello',
	     'command' => proc{print "hello\n"}).pack('fill'=>'x')
TkButton.new(nil,
	     'text' => 'quit',
	     'command' => 'exit').pack('fill'=>'x')

Tk.mainloop


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