Rails - Dec 2013 - "no such file to load -- my_extensions (MissingSourceFile)"

I have a Rails application runnng on one machien quite happily, using
Ruby 1.9.1-p243 and Rails 2.3.3.  I copied the app and config folders to
another machine, on which I'm also running 1.9.1-p243, but via RVM.
Whenever I try to launch the Rails application ('server',
'runner',
'console') I get the error message  "no such file to load --
my_extensions (MissingSourceFile)".

Based on one googled suggestion I created a nearly empty file,
$ROOT/config/initializers/my_extensions.rb
but this did not help.  I'm also wondering if I need to create a
'wrapper' as I've seen this mentioned int he contect of using Rails
and
RVM - but I can't see what I would need to do for, say, 'ruuner'. 
All
advice gratefully received.

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