job_manager_select2_multiselect_args is not defined

Hello,

I did download the Regions for WP Job Manager plugin, but that make an error in the console :

Uncaught ReferenceError: job_manager_select2_multiselect_args is not defined
    at Object.addSubmission (main.js?ver=20140525:33)
    at HTMLDocument.<anonymous> (main.js?ver=20140525:20)
    at HTMLDocument.dispatch (jquery.js?ver=1.12.4:3)
    at HTMLDocument.r.handle (jquery.js?ver=1.12.4:3)
    at Object.trigger (jquery.js?ver=1.12.4:3)
    at Object.a.event.trigger (jquery-migrate.min.js?ver=1.4.1:2)
    at a.fn.init.triggerHandler (jquery.js?ver=1.12.4:3)
    at Function.ready (jquery.js?ver=1.12.4:2)
    at HTMLDocument.K (jquery.js?ver=1.12.4:2)

I don’t uderstand if I have to fix that or to contact the plugin developper, can you help me please ?

The page I need help with: [log in to see the link]