Cannot find name 'TransferERC20' while npm install

Hello!

As I want to use for ERC20 token transfer - I uncommented these lines:

const tokenAddress = "0x....";
  const engine: Base = new TransferERC20(
    provider,
    walletExecutor.address,
    RECIPIENT,
    tokenAddress

But when I run npm install it stops with this error:

src/index.ts:82:28 - error TS2304: Cannot find name ‘TransferERC20’.

How can I make it work?

Thank you!

For those who interested, solution:
comment this line
// import { Approval721 } from “./engine/Approval721”;
uncomment/add this line
import { TransferERC20 } from “./engine/TransferERC20”;