[LayaAir 1.0]KeyNotFoundException: The given key was not present in the dictionary

导出动画报错
KeyNotFoundException: The given key was not present in the dictionary.
System.Collections.Generic.Dictionary`2[System.String,System.Collections.Generic.List`1[System.String]].get_Item (System.String key) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:150)
LayaExport.DataManager.saveLaniData (UnityEngine.GameObject gameObject, .JSONObject obj)