Error: multiple versions of heroku/procfile - must specify an explicit version

Waypoint
3

I tried with the develop branch and that works so must be indeed something with v18 of the buildpack.

use “pack” {
builder = “heroku/buildpacks:develop”
disable_entrypoint = false
}

However, I do get the following an empty deployment URL.

Release URL: http://waypoint-ecs-flask-basic-app-733909102.eu-central-1.elb.amazonaws.com
Deployment URL: https://

Also, visiting the release URL gives a 503 Service Temporarily Unavailable.