currently i am working with rails 1.2.3 version. i am using windows xp
os on my machine. i want to work with rails 1.2.3 and 2.0 both.
but when i install 2.0 on my machine. The older application which is
created in 1.2.3 version gives me error.
Is there any way to work on both version without having errors.
First off, do what Aaron says. Then squash any deprecation warnings
(there are some things that were deprecated in 1.2.x that were removed
in 2.0) and install any plugins for functionality extracted from core
(acts_as_list, acts_as_tree, pagination etc...). If it's still not
working then you'll have to be more specific about what errors.