Error on first step of tutorial

[KalessWave]

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Hi,

Following this tutorial (https://www.howtographql.com/graphql-js/1-getting-started/) will lead to the following error when trying to run the server:

Error: Must provide document.

As a beginner I did not really understood the issue, but it can be fixed by going to a more recent version of apollo-server instead of the version 2 used in the tutorial: "apollo-server": "^3.4.0",