Getting following errror while login using cas

[raja-anbazhagan]

Started GET "/redmine/cas?ref=/redmine/my/page" for XX.XX.XX.XX at 2018-01-30 16:50:22 +0530
Processing by WelcomeController#index as HTML
Current user: anonymous
Rendered welcome/index.html.erb within layouts/base (63.4ms)
Processing by AccountController#cas as HTML
Parameters: {"ref"=>"/redmine/my/page"}
Current user: anonymous
Completed 500 Internal Server Error in 148ms (ActiveRecord: 5.7ms)

NoMethodError (undefined method redirect_to_action' for #<AccountController:0x000055d890a267f0> Did you mean? redirect_to): plugins/redmine_cas/lib/redmine_cas/account_controller_patch.rb:20:in cas'
lib/redmine/sudo_mode.rb:63:in `sudo_mode'

Completed 200 OK in 480ms (Views: 367.5ms | ActiveRecord: 13.9ms)