Ok I made it work. Unfortunately, I do not understand why this worked, which is rather unsatisfactory, but I will tell you what I did. I stumbled upon some posts that said that the Heroki Kli was out of date if that happened. At first I tried updating it using npm using
npm update -g heroku-cli
which basically made the hero stop working all together, because now the Kli said that he needed node> 7.X (and I was still working on 6.X). The node update I updated did not help either, because now the Kli hero could not find the bash command.
In the end, I just reinstalled the hero. After that (first getting the same error as at the beginning), I first did
heroku update
and after that heroku login worked. Now, why I really donβt understand and maybe some of you guys know. But the version I had before heroku update was exaccty the same as after
heroku-cli / 5.11.12-8ae9780 (windows-amd64) go1.7.5
source share