Error on erc721 compile

[robertram]

Describe the bug
I created a erc721 smart contract using the create-web-dapp cli builder and checked the following extensions:
Enumerable, URIStorage, Burnable, Pausable.

This is the smart contract:
https://github.com/robertram/web3dapp/blob/main/backend/contracts/TestContract.sol

To Reproduce
Steps to reproduce the behavior:

1. Clone this repo https://github.com/robertram/web3dapp
2. cd ./backend
3. npm install
4. npm run build

Expected behavior
The smart contract built with the create-web-dapp cli builder should compile

Screenshots

Desktop (please complete the following information):

• OS: MacOS