internal error: nil Pkg importing "sync/atomic" from "internal/testlog"

[roelofjan-elsinga]

I'm following the Getting started tutorial and I'm getting the following error when I'm running revel run:

Revel executing: run a Revel application
WARN  08:49:38 harness.go:175: No http.addr specified in the app.conf listening on localhost interface only. This will not allow external access to your application 
Changed detected, recompiling
Parsing packages, (may require download if not cached)...2020/09/16 08:49:38 internal error: nil Pkg importing "sync/atomic" from "internal/testlog"

I've followed all steps, what am I missing?