I encounter this error many times. In all of them, the problem was about port forwarding. I solved it in this way:
- Open cmd (maybe as administrator), type "ipconfig" and hit Enter.
- Find your IPv4 address under Ethernet adaptor Local Area Connection (or everywhere else) and write it down.
- Go to Hamachi, System, Preferences, Settings, Advanced settings and Peer Connections.
- If Local UDP and TCP addresses are something different from the current IP (step 2), I would say congratulation. Correct IP to the new one and hit the OK key.