Redmine

[MOVED FROM "OPEN DISCUSSION" BY MODERATOR]

Hi all,
Please help me, i always get that production log when run plugin

http://github.com/mszczytowski/redmine_charts/

Processing ChartsBurndownController#index (for ::1 at 2013-04-15 16:33:05) [GET]
Parameters: {"controller"=>"charts_burndown", "project_id"=>"pj_1", "action"=>"index"}

TypeError (can't convert Hash into Array):
vendor/plugins/redmine_charts/app/controllers/charts_controller.rb:53:in `index'
<internal:prelude>:10:in `synchronize'
thin (1.3.1) lib/thin/connection.rb:80:in `block in pre_process'
thin (1.3.1) lib/thin/connection.rb:78:in `catch'
thin (1.3.1) lib/thin/connection.rb:78:in `pre_process'
thin (1.3.1) lib/thin/connection.rb:53:in `process'
thin (1.3.1) lib/thin/connection.rb:38:in `receive_data'
C:/BitNami/redmine-1.4.7-2/ruby/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0-x86-mingw32/lib/eventmachine.rb:187:in `run_machine'
C:/BitNami/redmine-1.4.7-2/ruby/lib/ruby/gems/1.9.1/gems/eventmachine-1.0.0-x86-mingw32/lib/eventmachine.rb:187:in `run'
thin (1.3.1) lib/thin/backends/base.rb:61:in `start'
thin (1.3.1) lib/thin/server.rb:159:in `start'
thin (1.3.1) lib/thin/controllers/controller.rb:86:in `start'
thin (1.3.1) lib/thin/runner.rb:185:in `run_command'
thin (1.3.1) lib/thin/runner.rb:151:in `run!'
thin (1.3.1) bin/thin:6:in `<top (required)>'
bin/thin:16:in `load'
bin/thin:16:in `<main>'

Rendering C:/BitNami/redmine-1.4.7-2/apps/redmine/htdocs/public/500.html (500 Internal Server Error)

How can i fix this error?
Thanks and best Regards