Error while compiling the contract file

My .env file's content is XINFIN_NETWORK_URL=https://rpc.apothem.network
XINFIN_PRIVATE_KEY=1234567890.............. (64 character long )
My hardhat.config.js is
require("@nomicfoundation/hardhat-toolbox");
require("dotenv").config({ path: ".env" });

const XINFIN_NETWORK_URL = process.env.XINFIN_NETWORK_URL;
const XINFIN_PRIVATE_KEY = process.env.XINFIN_PRIVATE_KEY;

if (!XINFIN_NETWORK_URL || !XINFIN_PRIVATE_KEY) {
throw new Error("Please set XINFIN_NETWORK_URL and XINFIN_PRIVATE_KEY in the .env file");
}

module.exports = {
solidity: "0.8.24",
networks: {
xinfin: {
url: XINFIN_NETWORK_URL,
accounts: [XINFIN_PRIVATE_KEY ],},
},
};
While trying to compile the .sol file in contract folder of the hardhat project the following error message is shown:
Error: Please set XINFIN_NETWORK_URL and XINFIN_PRIVATE_KEY in the .env file
at Object. (/home/skp/xdc-hardhat/hardhat.config.js:8:9)
at Module._compile (node:internal/modules/cjs/loader:1358:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1416:10)
at Module.load (node:internal/modules/cjs/loader:1208:32)
at Function.Module._load (node:internal/modules/cjs/loader:1024:12)
at Module.require (node:internal/modules/cjs/loader:1233:19)
at require (node:internal/modules/helpers:179:18)
at importCsjOrEsModule (/home/skp/xdc-hardhat/node_modules/hardhat/src/internal/core/config/config-loading.ts:29:22)
at loadConfigAndTasks (/home/skp/xdc-hardhat/node_modules/hardhat/src/internal/core/config/config-loading.ts:95:18)
at main (/home/skp/xdc-hardhat/node_modules/hardhat/src/internal/cli/cli.ts:218:62)

Please help me out from this problem