uniapp 打包app时会出现错误

[nyrf]

h5和小程序没问题

index.vue里只有一行代码

<template>
  <view class="p-20 shadow bgRed">app demo</view>
</template>

23:35:05.886 [Vue warn]: Error in directive css bind hook: "TypeError: Cannot convert undefined or null to object"
23:35:05.927 (found at pages/index/index.vue:1)
23:35:05.948 TypeError: Cannot convert undefined or null to object```