May you please open the console and show all error messages?
Here:
Uncaught TypeError: Cannot set property patb_rate of #<Game_Battler> which has only a getter
rpg_managers.js:1618 TypeError: undefined is not a function
at Game_Actor.Game_Battler.refresh (file:///C:/Users/Arjel/Documents/Games/Test%201/js/plugins/DoubleX%20RMMV%20Popularized%20ATB%20Core%20v000g.js:947:39)
at Game_Actor.refresh (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:3742:36)
at Game_Actor.initEquips (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:3570:10)
at Game_Actor.setup (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:3429:10)
at Game_Actor.initialize (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:3394:10)
at new Game_Actor (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:3379:21)
at Game_Actors.actor (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:4556:35)
at Game_Party.<anonymous> (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:4840:25)
at Array.forEach (native)
at Game_Party.setupStartingMembers (file:///C:/Users/Arjel/Documents/Games/Test%201/js/rpg_objects.js:4839:30)