uninitialized constant activesupport::HashWithinDifferentAccess

Added by Дмитрий Бабанов over 6 years ago

Hello. Please, help me.
I use:
Redmine version 2.1.4
Ruby version 1.9.3
Rails version 2.3.14
Database MySQL
Redmine_hudson-1.0.8.1

Plugin migrate successfully. But when i go administration/plugins/redmine hudson plugin and press "configure", appears error:

NameError in settingsController#plugin

uninitialized constant activesupport::HashWithinDifferentAccess

What's the problem?