Error: unsupported getDefaultProvider network (operation="getDefaultProvider", network={"chainId":42220,"name":"unknown"}

[Jordan-type]

Hello I added this packages to see the error will be resolved but nothing is working
"@ethersproject/address": "^5.5.0",
"@ethersproject/contracts": "^5.5.0",
"@ethersproject/networks": "^5.5.0",
"@ethersproject/providers": "^5.5.0"

,

[Jordan-type]

yarn add ethers resolved

const { ethers } = require("ethers")
let provider = new ethers.providers.JsonRpcProvider('https://forno.celo.org')