我已经编写了与文档建议相同的代码。

const mongoose = require("mongoose");
const Fawn = require("fawn");

mongoose
  .connect("mongodb://0.0.0.0:27017/rental")
  .then(() => console.log("Database rental connected"))
  .catch((err) => console.log(err.message));

Fawn.init(mongoose);

错误是：

C:\xampp\htdocs\mongo-rental\node_modules\fawn\lib\fawn.js:30
        throw new Error("The provided mongoose instance is invalid");
        ^

Error: The provided mongoose instance is invalid
    at Object.init (C:\xampp\htdocs\mongo-rental\node_modules\fawn\lib\fawn.js:30:15)
    at Object.<anonymous> (C:\xampp\htdocs\mongo-rental\index.js:15:6)
    at Module._compile (node:internal/modules/cjs/loader:1218:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1272:10)
    at Module.load (node:internal/modules/cjs/loader:1081:32)
    at Module._load (node:internal/modules/cjs/loader:922:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:23:47

我已经按照文档操作，仍然得到同样的错误。我已经删除并重新安装了两次这两个库。