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我创建了电子商务 mern 应用程序。它在本地工作,但在部署在 heroku 中后,它无法从服务器获取数据

它显示:

"message":"Operation `products.countDocuments()` buffering timed out after 10000ms",
"stack":"MongooseError: Operation `products.countDocuments()` buffering timed out after 10000ms\n    at Timeout.<anonymous> (/app/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:149:23)\n    at listOnTimeout (internal/timers.js:557:17)\n    at processTimers (internal/timers.js:500:7)"}

github中的代码链接:https ://github.com/vijay-guru/vshop

任何人请帮助我找到错误....

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