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Due to their dependency on lib/rake.rb#do_option which is not anymore in Rake 0.8.2. This is rather NetBeans problem since they depend on implementation detail.
Fixed: #cff60f0dcc86
Integrated into 'main-golden', will be available in build *200809130201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/cff60f0dcc86 User: Martin Krauskopf <mkrauskopf@netbeans.org> Log: #147043: NetBeans does not work with Rake 0.8.2
*** Issue 147443 has been marked as a duplicate of this issue. ***
*** Issue 147639 has been marked as a duplicate of this issue. ***
*** Issue 149201 has been marked as a duplicate of this issue. ***
I hope I'm not making an ignorant blunder, but I believe I am experiencing this issue running NetBeans IDE 6.5 (Build 200811100001) and also when I run the latest nightly build, NetBeans IDE Build 200812151401. Running either of these on Windows, when I create a new Ruby on Rails Application, the creation fails and displays a pop-up dialog box saying: "Rake tasks fetching failed with (working directory: my directory) Rails requires RubyGems >= 1.3.1 (You have 1.2.0.). Please `gem update --system' and try again' When I run gem update --system, there is nothing to update. I'm using Ruby version 1.8.6-111, my Rails version is 2.2.2, and the Rake gems installed are 0.8.3, 0.8.2, and 0.7.3. I'd be very grateful for any guidance you can give me to straighten this out.
The problem I had that caused me to reopen this issue seems to have been caused by a problem in my configuration. I reinstalled ruby, gems and rails and the problem has gone away. I apologize for any confusion or disruption my previous report caused.