NoMethodError:after_attachment_saved_callback_chain

现在在学习ror，在配置railscoders上传照片的部分，遇到问题undefined method `after_attachment_saved_callback_chain' for #Class:0x6b2f18c，哪位高手可以讲解下，感激不尽。

Application Trace | Framework Trace | Full Trace
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:1959:in method_missing_without_paginate'
C:/Documents and Settings/conan/����/pierreva-railscoders/vendor/plugins/will_paginate/lib/will_paginate/finder.rb:167:inmethod_missing'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:276:in send'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:276:inrun_callbacks'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/callbacks.rb:344:in callback'
C:/Documents and Settings/conan/����/pierreva-railscoders/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu.rb:373:inafter_process_attachment'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:178:in send'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:178:inevaluate_method'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:166:in call'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:93:inrun'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:92:in each'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:92:insend'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:92:in run'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:276:inrun_callbacks'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/callbacks.rb:344:in callback'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/callbacks.rb:251:increate_or_update'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:2555:in save_without_validation!'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/validations.rb:1088:insave_without_dirty!'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/dirty.rb:87:in save_without_transactions!'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:200:insave!'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in transaction'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:182:intransaction'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:200:in save!'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:208:inrollback_active_record_state!'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:200:in save!'
C:/Documents and Settings/conan/����/pierreva-railscoders/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu.rb:215:increate_or_update_thumbnail'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/core_ext/object/misc.rb:39:in returning'
C:/Documents and Settings/conan/����/pierreva-railscoders/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu.rb:207:increate_or_update_thumbnail'
C:/Documents and Settings/conan/����/pierreva-railscoders/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu.rb:368:in after_process_attachment'
C:/Documents and Settings/conan/����/pierreva-railscoders/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu.rb:368:ineach'
C:/Documents and Settings/conan/����/pierreva-railscoders/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu.rb:368:in after_process_attachment'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:178:insend'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:178:in evaluate_method'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:166:incall'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:93:in run'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:92:ineach'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:92:in send'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:92:inrun'
C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.4/lib/active_support/callbacks.rb:276:in run_callbacks'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/callbacks.rb:344:incallback'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/callbacks.rb:251:in create_or_update'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/base.rb:2538:insave_without_validation'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/validations.rb:1078:in save_without_dirty'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/dirty.rb:79:insave_without_transactions'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:229:in send'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:229:inwith_transaction_returning_status'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in transaction'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:182:intransaction'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:228:in with_transaction_returning_status'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:196:insave'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:208:in rollback_active_record_state!'
C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.4/lib/active_record/transactions.rb:196:insave'
C:/Documents and Settings/conan/����/pierreva-railscoders/app/controllers/user_photos_controller.rb:74:in create'
C:/Documents and Settings/conan/����/pierreva-railscoders/app/controllers/user_photos_controller.rb:72:increate'

[b]问题补充：[/b]
已经解决了，换用最新版本的attachment_fu就可以了。