Redmine

hello all,

i got error message after updating my redmine from windows server to Linux server i know that the is caused by the plugins incompatibility but my question is how can i know the plugins cause de probleme

thanks all for your help

this is the error message and my configuration

Started GET "/projects/dpt/activity" for 10.1.13.15 at 2014-05-13 16:02:11 +0000
Processing by ActivitiesController#index as HTML
Parameters: {"id"=>"dpt"}
Current user: admin (id=1)
Completed 500 Internal Server Error in 36ms

NameError (uninitialized constant Redmine::Acts::ActivityProvider::InstanceMethods::ClassMethods::ARCondition):
lib/redmine/activity/fetcher.rb:76:in `block (2 levels) in events'
lib/redmine/activity/fetcher.rb:75:in `each'
lib/redmine/activity/fetcher.rb:75:in `block in events'
lib/redmine/activity/fetcher.rb:74:in `each'
lib/redmine/activity/fetcher.rb:74:in `events'
app/controllers/activities_controller.rb:41:in `index'

my configuration:

Environment:
Redmine version 2.1.0.stable
Ruby version 1.9.3 (i686-linux)
Rails version 3.2.8
Environment production
Database adapter Mysql2
Redmine plugins:
no plugin installed (i didn't understand why it tell no plugins installed)

Regards.