I try to dockerizing my node server but I got an Error: Cannot find module './router/Seller'

Question

Here is my server.js file. I try to dockerizing my node server but I got an Error: Cannot find module './router/Seller'. How can I solve this problem?

const express = require("express");

const cors = require("cors")

const app = express();

const mongoose = require("mongoose");

const dotenv = require("dotenv")

const port = 5000;

const SellerRouter = require('./router/Seller'); 

dotenv.config(); 

mongoose.connect(`mongodb+srv://name:[email protected]/Databasename?retryWrites=true&w=majority`).then(()=>console.log("DB connected successfully")).catch((error)=>{
    console.log(error)
})

app.use(cors()); 

app.use(express.json());

app.use("/api/seller" , SellerRouter)

app.listen(port, ()=>{
    console.log(`SERVER IS RUNNING at http://localhost:${port}`)
}) 

Here is my Dockerfile:

FROM node:16 
WORKDIR /Backend
ENV PATH="./node_modules/.bin:$PATH"
COPY . .
COPY package*.json ./
RUN npm install
CMD [ "node", "index.js" ]


ENV MONGO_URL = mongodb+srv://name:Your [email protected]/Databasename?retryWrites=true&w=majority
ENV JWT_SEC = Your password
ENV PASS_SEC = Yourr password

Here is my result which means error

  at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (/Backend/index.js:9:22)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1155:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/Backend/index.js' ]
}
PS C:\Users\khadk\OneDrive\Desktop\dd>