Redmine

Hello,

i'm getting the following error while trying to save a Wiki:

ArgumentError (comparison of Symbol with Arel::Table failed):
  lib/plugins/acts_as_versioned/lib/acts_as_versioned.rb:440:in `next_version'
  lib/plugins/acts_as_versioned/lib/acts_as_versioned.rb:434:in `set_new_version'
  app/models/wiki_page.rb:185:in `block in save_with_content'
  app/models/wiki_page.rb:180:in `save_with_content'
  app/controllers/wiki_controller.rb:157:in `update'

The Wiki was working just fine, and there wasn't any new changes in the redmine installation. Now I can't save any wiki apparently.

My redmine environment:

Environment:
  Redmine version                          2.3.0.stable
  Ruby version                             1.9.3 (x86_64-linux)
  Rails version                            3.2.13
  Environment                              production
  Database adapter                         Mysql2
Redmine plugins:
  due_date_reminder                        0.4
  periodictask                             2.0.0
  redmine_dmsf                             1.4.5p1 stable
  redmine_hours                            0.1.0
  redmine_loader                           0.3b
  redmine_timesheet_plugin                 0.7.0

And the Gemlist:

*** LOCAL GEMS ***

actionmailer (3.2.13)
actionpack (3.2.13)
activemodel (3.2.13)
activerecord (3.2.13)
activeresource (3.2.13)
activesupport (3.2.13)
arel (3.0.2)
bigdecimal (1.1.0)
builder (3.0.4, 3.0.0)
bundler (1.3.5)
coderay (1.0.9)
daemons (1.1.9)
delayed_job (4.0.0)
delayed_job_active_record (4.0.0)
erubis (2.7.0)
eventmachine (1.0.3)
hike (1.2.2)
i18n (0.6.1)
io-console (0.3)
journey (1.0.4)
jquery-rails (2.0.3)
json (1.7.7, 1.5.4)
mail (2.5.3)
mime-types (1.22)
minitest (2.5.1)
multi_json (1.7.2)
mysql2 (0.3.11)
net-ldap (0.3.1)
nokogiri (1.5.9)
polyglot (0.3.3)
rack (1.4.5)
rack-cache (1.2)
rack-openid (1.3.1)
rack-protection (1.5.0)
rack-ssl (1.3.3)
rack-test (0.6.2)
rails (3.2.13)
railties (3.2.13)
rake (10.0.4, 0.9.2.2)
rdoc (3.12.2, 3.9.4)
ruby-openid (2.1.8)
rubyzip (0.9.9)
simple_enum (1.6.4)
sinatra (1.4.3)
sprockets (2.2.2)
thin (1.5.1)
thor (0.18.1)
tilt (1.3.7)
treetop (1.4.12)
tzinfo (0.3.37)
uuidtools (2.1.3)