For future reference: by default, the SDK licenses for any new Android Studio install are not accepted. You must accept them by going to the SDK Manager in the top right corner of the screen in the list of icons:
Then, in the list that appears, you need to check the box next to Android 9, API 29. Then click OK and accept the license when it appears, and let it download what it needs.
Also for future reference, a lot (not all) of the resources for programming in Android Studio provided by FIRST, specifically the pdf guide in this case, can be quite outdated. There are much better guides for these things like the one on gm0 (https://gm0.org/en/latest/docs/softw...id-studio.html).
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