Hi @sebtux! I don't think we've seen this error before. The fact that you're seeing the message at the end means that the infrastructure you're running matches v1.4. However, the message about Cannot find module './lib/model/migrate' is unexpected, because that file has existed since v1.2. That makes me think that your code for the server is still on v1.1 and doesn't match the infrastructure you're running. Did you run git submodule update -i? Try double-checking that you've followed all upgrade instructions. If you're still having trouble, run the following commands to see what version you're at, then post the result:
git rev-parse HEAD
git submodule