为什么出bug？[ app.json 文件内容错误] app.json: app.json 未找到

<view class="title">1、视图容器view的简单应用</view>
<view class='demo-box'>
   <view class='title'>(1)不阻止父容器的view_hover</view>
   <view class='view_son' hover-class="view_hower">我是子容器view</view>
</view>
<view class='demo-box'>
   <view class='title'>(2)阻止父容器的view_hover</view>
   <view class="view_parent" hover-class="view_hover">
   我是父容器view
   <view class ='view_son' hover-class="view_hover" hover-stop-propagation></view></view></view>

.view_parent {
  width: 100%;
  height: 300rpx;
  background-attachment: lightblue;
}
.view_son {
  width: 50%;
  height: 150rps;
  margin-left: 25%;
  margin-top: 50rpx;
  background-color: lightyellow;
}
.view_hover {
  background-color: red;
}