[Koha] Plugins disabled!

hi im using koha 18.05.10 and i want to install plugin to my koha for my OPAC i already enable at UseKohaPlugins but when i go to Tools>Plugin the error shown as below Plugins disabled! To enable Koha plugins, the system preference UseKohaPlugins must be enabled, and the flag enable_plugins must be set in the Koha configuration file anyone can help me??? tq for advance -- Sent from: http://koha.1045719.n5.nabble.com/Koha-general-f3047918.html