为什么龙骨动画总是报错呀。。。。。

at ArmatureData.addSlot (D:\CocosCreator\resources\engine\extensions\dragonbones\lib\dragonBones.js:5606:23)
at ObjectDataParser._parseArmature (D:\CocosCreator\resources\engine\extensions\dragonbones\lib\dragonBones.js:7285:30)
at ObjectDataParser.parseDragonBonesData (D:\CocosCreator\resources\engine\extensions\dragonbones\lib\dragonBones.js:8189:51)
at dragonBones_CCFactory.BaseFactory.parseDragonBonesData (D:\CocosCreator\resources\engine\extensions\dragonbones\lib\dragonBones.js:8572:52)
at dragonBones_ArmatureDisplay._parseDragonAsset (D:\CocosCreator\resources\engine\extensions\dragonbones\ArmatureDisplay.js:358:55)
at dragonBones_ArmatureDisplay.notify (D:\CocosCreator\resources\engine\extensions\dragonbones\ArmatureDisplay.js:94:22)
at dragonBones_ArmatureDisplay.val.set (D:\CocosCreator\resources\engine\cocos2d\core\platform\preprocess-class.js:65:20)
at dragonBones_ArmatureDisplay.r.set [as dragonAsset] (D:\CocosCreator\resources\app.asar\editor\page\scene-utils\asset-watcher.js:1:766)
at D:\CocosCreator\resources\app.asar\editor\page\scene-utils\set-property-by-path.js:1:469
at CCLoader. (D:\CocosCreator\resources\engine\cocos2d\core\platform\CCAssetLibrary.js:110:17)