[Rails] Radiant could not be initialized. Please verify that vendor/radiant contains a complete copy of the

hi i am working on configuring existing application on locally as well as server but i got an error 

i use radaint 0.8.2, rails 2.3.4, ruby 1.8.7 and rubygems 1.4.2. 

 script/server -e production -p 3001

Radiant could not be initialized. Please verify that vendor/radiant contains a complete copy of the Radiant sources.

is there above explained version is dependable? i use according to app. or any dependent gem is needed?

i already install cucumber.

and i tried  to re-install also.

please help me 

thank you in advance 

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