Ruby on Rails framework could not be loaded

Ruby on Rails framework version 1.2.3 seems to be corrupted. Please reinstall it. This can be done with the following command:

gem install rails --version 1.2.3

Framework that failed to load:

Rails framework version 1.2.3

Error message:

A dummy exception.

Exception class:

StandardError

Backtrace:

#	File	Line	Location
0	./render_error_pages.rb	17	in `create_dummy_exception'
1	./render_error_pages.rb	63	in `start'
2	./render_error_pages.rb	89