Redmine

Hi

I have migrated my Redmine 1.0.2 to 1.3.0. Everything was good,when i click to administration-Custom fields its shows an error but all other tabs are working fine

Here is the list of plugin that i am using in my new redmine

1.Google Apps plugin
2.Redmine Code Review plugin
3.Redmine Hudson plugin
4.Redmine Changer plugin
5. Stuff To Do Plugin

Please help me my redmine upgrade is stooped due to this error

Here

ERROR LOG IS:

ActiveRecord::SubclassNotFound (The single-table inheritance mechanism failed to locate the subclass: 'ScrumblerIssueCustomField'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite CustomField.inheritance_column to use another column for that information.):
app/controllers/custom_fields_controller.rb:24:in `index'
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'