Need help with extension for radiant cms

Hello all,

Am a newbie to radiant cms…M getting an error when just trying to
install an extension
script/extension install paperclip
and also it doesnt matter whichever extension i give

/usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/vendor/rails/activeresource/lib/active_resource/connection.rb:206:in
handle_response': Failed with 500 Internal Server Error (ActiveResource::ServerError) from /usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/vendor/rails/activeresource/lib/active_resource/connection.rb:173:inrequest’
from
/usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/vendor/rails/activeresource/lib/active_resource/connection.rb:138:in
get' from /usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/vendor/rails/activeresource/lib/active_resource/base.rb:642:infind_every’
from
/usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/vendor/rails/activeresource/lib/active_resource/base.rb:585:in
find' from /usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/lib/radiant/extension/script.rb:290:inload_extensions’
from
/usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/lib/radiant/extension/script.rb:294:in
find_extension' from /usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/lib/radiant/extension/script.rb:307:ininitialize’
from
/usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/lib/radiant/extension/script.rb:261:in
new' from /usr/local/lib/ruby/gems/1.8/gems/radiant-0.9.1/lib/radiant/extension/script.rb:261:inexecute’
from script/extension:5

Pls help me get out of this bug. Thanks in advance.