If you get such an error, then you did not (or not correctly) follow step 2 of the instructions:
- Log in into your KuCoin account and navigate to the API page (https://kucoin.com/account/api)
- Enter 'cointracking' into the API Passphrase field
- Create a new API key
- DISABLE the trade permission for your new API key
- Enter your Key and your Secret here
... and generate another key.