flutter引入图片 Mapping values are n

引入本地图片报错
Error on line 55, column 10 of pubspec.yaml: Mapping values are not allowed here. Did you miss a colon earlier?
assets:
^
Unable to reload your application because "flutter packages get" failed to update package dependencies.
Exception: pub get failed (65)

我的代码如下

flutter:
  uses-material-design: true

    assets:
    - assets/tab/home.png
    - assets/tab/home_h.png
    - assets/tab/product.png
    - assets/tab/product_h.png
    - assets/tab/client.png
    - assets/tab/client_h.png
    - assets/tab/tool.png
    - assets/tab/tool_h.png
    - assets/tab/mine.png
    - assets/tab/mine_h.png

报错的原因是assets前面多了两空格，把assets和uses-material-design对齐

flutter:
  uses-material-design: true

  assets:
    - assets/tab/home.png
    - assets/tab/home_h.png
    - assets/tab/product.png
    - assets/tab/product_h.png
    - assets/tab/client.png
    - assets/tab/client_h.png
    - assets/tab/tool.png
    - assets/tab/tool_h.png
    - assets/tab/mine.png
    - assets/tab/mine_h.png