相关疑难解决方法(0)

我收到这个错误，虽然项目中没有一行带有：first-child，为什么会出现？

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 "dependencies": {
    "@storybook/addon-a11y": "^5.1.9",
    "@trendmicro/react-popover": "^0.4.0",
    "@types/classnames": "^2.2.9",
    "@types/jest": "24.0.13",
    "@types/node": "12.0.2",
    "@types/react": "16.8.18",
    "@types/react-dom": "16.8.4",
    "@types/react-modal": "^3.8.2",
    "@types/storybook__addon-a11y": "^5.0.0",
    "@types/storybook__addon-actions": "^3.4.3",
    "@types/storybook__addon-info": "^4.1.1",
    "@types/storybook__addon-knobs": "^5.0.0",
    "@types/storybook__react": "4.0.1",
    "@types/styled-components": "4.1.15",
    "classnames": "^2.2.6",
    "grommet": "^2.7.2",
    "react": "16.8.6",
    "react-dom": "16.8.6",
    "react-modal": "^3.9.1",
    "react-scripts": "3.0.1",
    "react-toastify": "^5.3.2",
    "styled-components": "^4.2.0",
    "typescript": "^3.5.1"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject",
    "storybook": "start-storybook",
    "build-storybook": "build-storybook -c .storybook -o .out",
    "lint": "tslint -c …