Redmine

Hi everyone,
i am login to redmine as administrator, then go to admininstraion/projects --> select a project --> then click delete a repository --> then say "yes" to delete. i got this error message:

Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.
If you are the Redmine administrator, check your log files for details about the error.

Here is the log:
@Connecting to database specified by database.yml
Creating scope :sorted. Overwriting existing method User.sorted.
Creating scope :sorted. Overwriting existing method Group.sorted.
Creating scope :system. Overwriting existing method Enumeration.system.
Started DELETE "/projects/projet-d" for 127.0.0.1 at 2014-10-31 07:59:55 +0100
Processing by ProjectsController#destroy as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"g7ZFEryB6lGc7XOqZ+Ag3ErmKt7+IdnOci2V6xo8k/8=", "confirm"=>"1", "commit"=>"Delete", "id"=>"projet-d"}
Current user: admin (id=1)
Completed 500 Internal Server Error in 359.6ms

NameError (uninitialized constant Project::Expense):
app/controllers/projects_controller.rb:236:in `destroy'@

when i run script/about

@C:\Sites\redmine>ruby script/about

Environment:
Redmine version 2.6.0.stable
Ruby version 2.1.3-p242 (2014-09-19) [i386-mingw32]
Rails version 3.2.19
Environment production
Database adapter Mysql2
SCM:
Git 1.9.2
Filesystem
Redmine plugins:
progressive_projects_list 1.0.0
redmine_contacts 3.4.2
redmine_contacts_invoices 3.2.1
redmine_finance 1.2.0
redmine_mentions 0.0.1
redmine_theme_changer 0.1.0
@

When i do gem list
@C:\Sites\redmine>gem list

• LOCAL GEMS ***

actionmailer (3.2.19)
actionpack (3.2.19)
activemodel (3.2.19)
activerecord (3.2.19)
activerecord-mysql2-adapter (0.0.3)
activerecord-tableless (1.3.3)
activeresource (3.2.19)
activesupport (3.2.19)
acts-as-taggable-on (2.3.3)
acts_as_list (0.2.0)
acts_as_silent_list (1.2.0)
addressable (2.3.4)
afm (0.2.2)
arel (3.0.3)
Ascii85 (1.0.2)
awesome_nested_set (2.1.6)
axiom-types (0.1.1)
bigdecimal (1.2.4)
binding_of_caller (0.7.2)
bourbon (4.0.0)
bourne (1.4.0)
builder (3.0.4)
bundler (1.7.4)
capybara (2.3.0, 2.1.0)
capybara-screenshot (0.3.6)
celluloid (0.15.2)
childprocess (0.5.3, 0.3.9)
climate_control (0.0.3)
cocaine (0.5.4)
codeclimate-test-reporter (0.1.1)
coderay (1.1.0, 1.0.9)
coercible (1.0.0)
coffee-rails (3.2.2)
coffee-script (2.2.0)
coffee-script-source (1.6.2)
color-tools (1.3.0)
cucumber (1.3.8)
cucumber-rails (1.3.1)
cucumber-rails-training-wheels (1.0.0)
daemons (1.1.9)
dalli (2.6.4)
database_cleaner (1.2.0, 1.0.1)
date_validator (0.7.0)
debug_inspector (0.0.2)
delayed_job (3.0.5)
delayed_job_active_record (0.3.3)
descendants_tracker (0.0.4)
diff-lcs (1.2.5, 1.2.4)
disposable (0.0.4)
equalizer (0.0.9)
erubis (2.7.0)
eventmachine (1.0.3 x86-mingw32)
execjs (1.4.0)
factory_girl (4.2.0)
factory_girl_rails (4.2.1)
faker (1.2.0)
ffi (1.9.3 x86-mingw32)
formatador (0.2.4)
gherkin (2.12.2 x86-mingw32)
globalize (3.0.0)
gon (4.0.0)
grape (0.7.0)
gravatar_image_tag (1.2.0)
guard (2.2.2)
guard-cucumber (1.4.0)
guard-rspec (3.1.0)
guard-test (1.0.0)
hashery (2.1.1)
hashie (2.1.1)
hike (1.2.3)
hooks (0.3.3)
htmldiff (0.0.1)
i18n (0.6.11, 0.6.8)
i18n-js (3.0.0.rc6)
ice_nine (0.11.0)
interception (0.3)
io-console (0.4.2)
journey (1.0.4)
jquery-atwho-rails (0.4.1)
jquery-rails (3.1.2, 2.0.3)
jquery-ui-rails (4.0.2)
json (1.8.1)
json_spec (1.1.1)
launchy (2.3.0)
letter_opener (1.0.0)
liquid (2.4.1)
listen (2.1.2)
livingstyleguide (1.2.0)
lockfile (2.1.3)
lumberjack (1.0.4)
mail (2.5.4)
metaclass (0.0.1)
method_source (0.8.2)
mime-types (1.25.1)
mini_portile (0.6.0)
minisyntax (0.2.3)
minitest (4.7.5)
mocha (0.13.3)
money (5.1.1)
multi_json (1.10.1, 1.8.2)
multi_test (0.0.2)
multi_xml (0.5.5)
mysql (2.9.1 x86-mingw32)
mysql2 (0.3.16, 0.3.11 x86-mingw32)
net-ldap (0.3.1, 0.2.2)
nokogiri (1.6.2.1 x86-mingw32, 1.5.11 x86-mingw32)
non-stupid-digest-assets (1.0.4)
object-daddy (1.1.1)
oj (2.1.6)
omniauth (1.2.1)
paper_trail (2.7.2)
pdf-core (0.2.5)
pdf-reader (1.3.3)
pg (0.17.1 x86-mingw32)
polyglot (0.3.5, 0.3.3)
prawn (1.0.0, 0.14.0)
prototype-rails (3.2.1)
pry (0.9.12.6 i386-mingw32, 0.9.12.2 i386-mingw32)
pry-doc (0.4.6)
pry-rails (0.3.2)
pry-rescue (1.1.1)
pry-stack_explorer (0.4.9.1)
psych (2.0.5)
quiet_assets (1.0.2)
rabl (0.9.3)
rack (1.4.5)
rack-accept (0.4.5)
rack-cache (1.2)
rack-mount (0.8.3)
rack-openid (1.4.2)
rack-ssl (1.3.4)
rack-test (0.6.2)
rack_session_access (0.1.1)
rails (3.2.19)
rails-dev-tweaks (0.6.1)
rails_autolink (1.1.0)
railties (3.2.19)
rake (10.3.2, 10.1.0)
rake-compiler (0.9.3)
rb-fsevent (0.9.3)
rb-inotify (0.9.2)
rb-readline (0.5.1, 0.5.0)
rbpdf (1.18.2)
rdoc (4.1.0, 3.12.2)
redcarpet (3.0.0, 2.3.0)
reform (1.0.4)
request_store (1.0.5)
roar (0.12.7)
rspec (2.99.0, 2.13.0)
rspec-activemodel-mocks (1.0.1)
rspec-collection_matchers (1.0.0)
rspec-core (2.99.0, 2.13.1)
rspec-example_disabler (0.0.1)
rspec-expectations (2.99.0, 2.13.0)
rspec-mocks (2.99.0, 2.13.1)
rspec-rails (2.99.0, 2.13.2)
ruby-ole (1.2.11.7)
ruby-openid (2.3.0, 2.2.3)
ruby-prof (0.13.0)
ruby-progressbar (1.2.0)
ruby-rc4 (0.1.5)
rubytree (0.8.3)
rubyzip (1.1.6, 1.1.0)
sass (3.3.14, 3.2.9)
sass-rails (3.2.6)
select2-rails (3.3.2)
selenium-webdriver (2.43.0, 2.39.0)
shoulda (3.5.0)
shoulda-context (1.1.2)
shoulda-matchers (2.1.0)
simplecov (0.8.0.pre)
simplecov-html (0.7.1)
slop (3.5.0, 3.4.6)
spreadsheet (0.6.9)
sprockets (2.2.2, 2.2.2.backport2)
sqlite3 (1.3.7 x86-mingw32)
strong_parameters (0.2.1)
structured_warnings (0.1.4)
svg-graph (1.0.5)
syck (1.0.1)
test-unit (2.5.5, 2.1.3.0)
thin (1.5.1)
thor (0.19.1, 0.18.1)
thread_safe (0.3.4)
tilt (1.4.1)
timecop (0.6.1)
timers (1.1.0)
treetop (1.4.15)
ttfunk (1.1.1, 1.0.3)
tzinfo (0.3.42, 0.3.38)
uber (0.0.4)
uglifier (2.1.1)
vcard (0.2.12)
virtus (1.0.2)
websocket (1.2.1, 1.0.7)
wicked_pdf (0.11.0)
will_paginate (3.0.5)
win32console (1.3.2 x86-mingw32)
wkhtmltopdf-binary (0.9.9.3)
xpath (2.0.0)
yard (0.8.7.2)@

Anyone have any clue on how to fix this please?