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我在 Angular 应用程序上使用graphQL 代码生成器，并尝试从本地 Nestjs 应用程序加载我的架构。

这是 codegen.yml 文件：

schema: http://localhost:3000/graphql
documents: ./src/app/graphql/**/*.graphql
generates:
  ./src/app/graphql/types.ts:
    plugins:
      - typescript
      - typescript-operations
      - typescript-apollo-angular

当我运行 graphql-codegen 时，出现以下错误：

 Failed to load schema from http://localhost:3000/graphql:

        invalid json response body at http://localhost:3000/graphql reason: Unexpected token < in JSON at position 0
        FetchError: invalid json response body at http://localhost:3000/graphql reason: Unexpected token < in JSON at position 0
    at C:\ngWishList2\node_modules\node-fetch\lib\index.js:271:32
    at processTicksAndRejections (internal/process/task_queues.js:94:5)
    at async UrlLoader.load (C:\ngWishList2\node_modules\@graphql-toolkit\url-loader\index.cjs.js:87:22)
    at async C:\ngWishList2\node_modules\@graphql-toolkit\core\index.cjs.js:682:25        
    at async Promise.all (index …