I think the Cardano Developer Portal may be slightly out of date or deprecated. If you are starting from scratch I would recommend following one of the guides available on the forum or externally.
I would recommend following one of Alex’s guides as they are quite comprehensive to say the least. Might want to check out the git checkouts to make sure your getting the latest repo
The Coincashew guide is also very straight forward and I believe it checks out the latest repo but best to double check.