This means the app does detect that you have the Metamask extension on your browser, but that you haven't connected to any address with it. The "User denied web3 access" is displayed in the console when that is the case.
I have updated to tutorial (and repo) so that the error is explicitly displayed on the page as well.
Thank you for your question! Don't hesitate if you have any other!
iniubong Obonguko
I get this error when I try to run the project
index.vue?6ced:48 User denied web3 access Error: Provided address null is invalid, the capitalization checksum test failed, or it's an indirect IBAN address which can't be converted. at Method.inputAddressFormatter