NoMethodError undefined method `flat_map' (available_filters and build_from_params)

[assistiago]

Hi guys, first sorry for my english!
I need help to solve a problem with my redmine!

Basic settings:
Environment:
Redmine version 2.6.10.stable
Ruby version 1.8.7-p358 (2012-02-08)
Rails version 3.2.22.2
Environment production
Database adapter MySQL
SCM:
Subversion 1.6.12
Mercurial 2.2.2
Bazaar 2.1.2
Git 1.7.10.4
Filesystem
Redmine plugins:
redmine_time_tracker 0.9.8

I try click TimeTracker(Overview)Main menu bar (upper left corner) and returned ...

tail -f production.log

Processing by TtOverviewController#index as HTML
Current user: assis (id=37)
Completed 500 Internal Server Error in 206.6ms

NoMethodError (undefined method flat_map' for #<Array:0xc080fa0>): app/models/query.rb:346:inavailable_filters'
app/models/query.rb:235:in `build_from_params'

I thank Help!!!!