Redmine

Hi All,
i login redmine as administrator, then go to admininstraion/projects --> select status(closed) --> then click delete. I got this error message:

Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.

If you are the Redmine administrator, check your log files for details about the error.

I have no idea how to fix this issue, please give me some hint. I appreciate your help.
From log file:

Started DELETE "/projects/light-box-test" for 172.20.0.90 at 2019-11-07 12:25:02 +0800 
Processing by ProjectsController#destroy as HTML
  Parameters: {"authenticity_token"=>"JXNU7/NxINBFo9vALlOEusCKyDDWYj9UhvKB8yLWwGvnEWI4kreFUagMacTAasc3RO2BHzOiStwMr8mf2sNZIQ==", "id"=>"light-box-test"}
  Current user: admin (id=1)
  Rendering projects/destroy.html.erb within layouts/base
  Rendered projects/destroy.html.erb within layouts/base (3.9ms)
Completed 200 OK in 155ms (Views: 46.3ms | ActiveRecord: 68.0ms)
Started DELETE "/projects/light-box-test" for 172.20.0.90 at 2019-11-07 12:25:04 +0800 
Processing by ProjectsController#destroy as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"ld9r+kh9UWiJC0Qs+VY91TXODyiK5jr+5YCYyaby5KlXvV0tKbv06WSk9igXb35YsalGB28mT3Zv3dClXud94w==", "confirm"=>"1", "commit"=>"Delete", "id"=>"light-box-test"}
  Current user: admin (id=1)
Completed 500 Internal Server Error in 104ms (ActiveRecord: 42.0ms)

ActiveRecord::StatementInvalid (Mysql2::Error: Table 'redmine.easy_settings' doesn't exist: SHOW FULL FIELDS FROM `easy_settings`):

app/controllers/projects_controller.rb:234:in `destroy'
lib/redmine/sudo_mode.rb:63:in `sudo_mode'
plugins/redmine_dmsf/lib/redmine_dmsf/webdav/custom_middleware.rb:68:in `call'

Do you have any idea for this?