Redmine

I have installed redmine 5.0 and want to configure redmine_agile plugin 1.6.5 but i got following error when i clicked on configure in browser
Internal error
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------Also following error in redmine container
I, [2023-08-10T06:02:50.514963 #1] INFO -- : Started GET "/settings/plugin/redmine_agile" for 10.x.y.z at 2023-08-10 06:02:50 +0000
I, [2023-08-10T06:02:50.515958 #1] INFO -- : Processing by SettingsController#plugin as HTML
I, [2023-08-10T06:02:50.516020 #1] INFO -- : Parameters: {"id"=>"redmine_agile"}
I, [2023-08-10T06:02:50.528010 #1] INFO -- : Current user: ramesh (id=38)
I, [2023-08-10T06:02:50.530972 #1] INFO -- : Completed 500 Internal Server Error in 15ms (ActiveRecord: 8.2ms | Allocations: 1545)
F, [2023-08-10T06:02:50.532259 #1] FATAL -- :
Psych::DisallowedClass (Tried to load unspecified class: Set):

app/models/setting.rb:111:in `value'
app/models/setting.rb:125:in `[]'
app/models/setting.rb:320:in `plugin_redmine_agile'
app/controllers/settings_controller.rb:78:in `plugin'
lib/redmine/sudo_mode.rb:61:in `sudo_mode'