undefined method 'remaining_effort'

[ffa]

ActionView::TemplateError (undefined method `remaining_effort' for #<Issue:0x7f6a1c5d1f00>) on line #11 of vendor/plugins/scrum_task_board/app/views/task_boards/_feature.rhtml:
8:   <div class="toggle_details" title="Show Details">Show Details</div>
9: </div>
10: <div class="current_data">
11:   <p class="estimate" style="right: 2px;"><%= feature.remaining_effort ? feature.remaining_effort : '' %></p>
12:   <p class="assignee <%= "current_is_assigned" if feature.assigned_to.eql? User.current %>"><%= feature.assigned_to ? feature.assigned_to : '' %></p>
13:   <p class="status"><%= feature.status.name %></p>
14:   <hr/>

    vendor/plugins/scrum_task_board/app/views/task_boards/_feature.rhtml:11:in `_run_rhtml_vendor47plugins47scrum_task_board47app47views47task_boards47_feature46rhtml_locals_feature_object'
    vendor/plugins/scrum_task_board/app/views/task_boards/_row.html.erb:5
    vendor/plugins/scrum_task_board/app/views/task_boards/show.html.erb:70
    vendor/plugins/scrum_task_board/app/views/task_boards/show.html.erb:67:in `each'
    vendor/plugins/scrum_task_board/app/views/task_boards/show.html.erb:67
   [removed some output]

[srilur]

I get the same issue, Is this a known issue? I wonder if Scrum-task-board is supported by new versions of Redmine like 1.2.1 or 1.3 which is what I am using. Any help will be appreciated.