After upgrading my jenkins plugin in version 2.479.2 , drop down not works

when selecting Execute OpKey SaaS TestSuite it’s not opening,showing this on console.

attached my config.jelly file
config.zip (29.0 KB)

Is that a closed source plugin?
Which Jenkins version have you been using before?

yes it’s closed source plugin, I’m using 2.414.3 before

might be that you’re using prototype code then. prototype.js was removed with 2.426.3