I've tried to figure this out but I'm honestly stumped. I decided to start working on a new project after some time. Originally I always used version 1.3.4 of MV to make games but for some reason the yanfly plugins would not work, specifically the core engine and action sequences giving errors. So I thought maybe yanfly had to update his plugins for 1.6.1 so I've moved up to 1.6.1, started a new project, placed the plugins in only for more errors to show. I'm out of ideas at this point. It's been several months since I did a project so I'm a bit out of the loop but last time I simply put them in and boom, no issues. I removed the action sequences but I really need them in this project so I have to find out why they aren't working anymore. Keep in mind its a brand new project. Here is the error in the console I get... Code: Uncaught TypeError: this.furthestRight is not a function at eval (eval at <anonymous> (YEP_BattleEngineCore.js:1246), <anonymous>:1:6) at YEP_BattleEngineCore.js:1246 pixi.js:27682 PixiJS 4.5.4 - ✰ WebGL ✰ http://www.pixijs.com/ ♥♥♥ rpg_managers.js:1949 TypeError: this.isBattleSystem is not a function at Function.BattleManager.isATB (YEP_X_BattleSysATB.js:1000) at Game_Actor.Game_BattlerBase.refresh (YEP_X_BattleSysATB.js:1788) at Game_Actor.Game_Battler.refresh (rpg_objects.js:3000) at Game_Actor.refresh (rpg_objects.js:3756) at Game_Actor.initEquips (rpg_objects.js:3584) at Game_Actor.setup (rpg_objects.js:3443) at Game_Actor.setup (Galv_WeaponProf.js:292) at Game_Actor.initialize (rpg_objects.js:3408) at new Game_Actor (rpg_objects.js:3393) at Game_Actors.actor (rpg_objects.js:4587) I also uploaded an image of the plugins currently installed. Any help would be greatly appreciated and if this is a common problem then I apologize. I tried searching the errors but to no avail.