Issue with project How to Make an NFT

Hello, I am working on the project “How to Make an NFT in 14 Lines of Code”.

I got stuck at the point with the deployment script:

node ./scripts/deploy.js

It gives me error messages:
Error: insufficient funds for intrinsic transaction cost (error={“name”:“ProviderError”,“code”:-32000,"_isProviderError":true}, method=“sendTransaction”, transaction=undefined, code=INSUFFICIENT_FUNDS, version=providers/5.5.0)

However, I have now more than 10 Ethereum (Ropsten network), and according to some posts in the internet the error message might be misleading.

Now I would like to know how much of the test Ether I will need (about) ?
And how can I debug this error ?

Hope I am correct at this place, it is the first time I am posting in this forum.