acts as tree - problem when installing rails plugins -

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i'm trying install acts_as_tree plugin, got no error command line still :

undefined local variable or methodacts_as_tree' #`

the vendor/acts_as_tree empty , when try install again :

already installed: acts_as_tree (git://github.com/rails/acts_as_tree.git)

i'm running rails 2.3.5 on windows aptana 2 , instantrails

i missing git


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