From: Brian Candler <b.candler@...>
Date: 2010-06-17T16:57:59+09:00
Subject: Re: Help with errors:

Ted Flethuseo wrote:
> I was running some scripts but the following lines are giving
> me errors. Now I"m not sure if this methods don't exist in ruby
> or I don't have the libraries for them:
> 
> 
> NoMethodError: undefined method `sync=' for IO:Class
> 
> at top level  in writeFile.rb at line 26

Show your code, i.e. contents of writeFile.rb around that line.

It looks to me like you've written

    IO.sync = true

which won't work - exactly as the error says, there's no sync= method 
for the IO class.

This method exists for *instances* of IO. For example:

    fd = File.open("foo","w")   # returns an instance of IO subclass
    fd.sync = true

> NameError: undefined local variable or method ‘ruby_ode’ for main:Object
> 
> at top level  in whitespace.rb at line 12

Again, this looks like a bug in line 12 of whitespace.rb, which I 
presume is your code since the error doesn't say 
/path/to/some/lib/whitespace.rb.

You are trying to invoke a non-existent method called "ruby_ode". Why do 
you think that such a method exists? Did you define it earlier? Is it in 
some library, did you remember to require the library?

> How do I update this libraries for ruby on a Mac, without ending up with
> two different copies of ruby.

Unless you can provide evidence to the contrary, so far it looks like 
the problem is nothing to do with ruby. But you need to provide more 
details of both the code you are running and the exceptions you see. 
Ideally, you should shrink the problem down to the smallest possible 
program you can which replicates the problem, e.g.

require 'rubygems'
require 'some_strange_gem'
puts ruby_ode

Regards,

Brian.
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