Please help, the plugin does not work

Dear,
I don’t know why, or does it need to add any js file or not, the plugin does not work for me.

I reinstall the plugin, the problem is the same.

My link here, please help.

http://hocdaocaodai.com/nhac-nho-ngay-ngai-ra-di/

Thanks!

Ly

https://wordpress.org/plugins/mp3-jplayer/