Problems with pkp.min.js and jquery

We just upgraded from ojs 3.1 to latest stable version (installed master branch on github) following recomended steps. and now header on administrator panel is not loading actually there’s a problem with jquery.

on console we see this
Uncaught TypeError: Cannot read property ‘prototype’ of undefined
at pkp.min.js?v=
at pkp.min.js?v=

Hi @Abror_Aliboyev,

The master branch on GitHub is not stable – it’s unreleased code. Use either one of the release packages from the download page, or if you want to use git, one of the stable branches (e.g. stable-3_1_2).

Alec Smecher
Public Knowledge Project Team