[ app.json 文件内容错误] app.json: 在项目根目录未找到 app.json (env: Windows,mp,1.06.2301160; lib: 2.19.4)

根据提供的引用内容，这个问题的解决方法有两种：
1. 配置project.config.json文件路径，在project.config.json文件中添加以下代码：

{
  "miniprogramRoot": "./",
  "projectname": "your_project_name",
  "description": "project description",
  "appid": "",
  "setting": {
    "urlCheck": true,
    "es6": true,
    "postcss": true,
    "minified": true,
    "newFeature": true
  },
  "compileType": "miniprogram",
  "condition": {
    "search": {
      "current": -1,
      "list": []
    },
    "conversation": {
      "current": -1,
      "list": []
    },
    "plugin": {
      "current": -1,
      "list": []
    },
    "game": {
      "currentL": -1,
      "list": []
    }
  },
  "packOptions": {
    "ignore": []
  },
  "scripts": {},
  "appid": "your_appid",
  "projectConfig": {
    "projectname": "your_project_name",
    "appid": "your_appid",
    "libVersion": "2.19.4",
    "simulatorType": "wechat",
    "simulatorPluginLibVersion": {},
    "condition": {
      "search": {
        "current": -1,
        "list": []
      },
      "conversation": {
        "current": -1,
        "list": []
      },
      "plugin": {
        "current": -1,        "list": []
      },
      "game": {
        "currentL": -1,
        "list": []
      }
    }
  }
}

2. 关闭项目，重新打开，直接选择子文件夹下包含有app.json的文件打开，例如上面提到的myFirst文件夹，打开后就不会报错了。