异常如下:
解决方案:
https://github.com/azchohfi/LottieUWP
If your app is crashing at runtime and you are using Visual Studio, make sure the Build Action for each of your .json files is set to 'Content' and not the default 'None.' To change this, click on the file in the Solution Explorer and change the selection in the dropdown next to 'Build Action' under the 'Advance' header in the properties window.
Json文件，修改生成操作为---->内容
