TypeError: Cannot read property 'parent' of undefined
    at Sprite.PIXI.DisplayObjectContainer.addChildAt (file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/libs/pixi.js:1918:17)
    at Sprite.PIXI.DisplayObjectContainer.addChild (file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/libs/pixi.js:1903:17)
    at Sprite_Enemy.addVisualATBWindow (file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/plugins/YEP_X_VisualATBGauge.js:174:24)
    at Sprite_Enemy.update (file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/plugins/YEP_X_VisualATBGauge.js:167:10)
    at file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/rpg_core.js:3290:19
    at Array.forEach (native)
    at Sprite.update (file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/rpg_core.js:3288:19)
    at file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/rpg_core.js:3290:19
    at Array.forEach (native)
    at Sprite.update (file:///C:/Users/Administrator/Desktop/NEW%20GAME/js/rpg_core.js:3288:19)

错误日志