Run examples on single machines with multiple ips

[hamedgibago]

Hello, I want to run experiments on my single local machine with multiple ips. I defined 4 ips:
192.168.2.14
192.168.2.15
192.168.2.16
192.168.2.17

14 and 15 are my clients and 16, 17 are my replicas. With notice to the link https://github.com/hot-stuff/libhotstuff/tree/master/scripts/deploy I first defined clients.txt like this:

192.168.2.14
192.168.2.15

and replicas.txt like:

192.168.2.16 192.168.2.17
192.168.2.17 192.168.2.16

After running ./gen_all.sh 400 and calling ./run.sh setup I received this error:

# Gathering Facts *********************************************************************************************************
  * 192.168.2.14               - FAILED!!! ------------------------------------------------------
    Failed to connect to the host via ssh: Warning: Permanently added '192.168.2.14' (ED25519) to the list of known hosts.
    ubuntu@192.168.2.14: Permission denied (publickey,password).                                                               
  * 192.168.2.15               - FAILED!!! ------------------------------------------------------
    Failed to connect to the host via ssh: Warning: Permanently added '192.168.2.15' (ED25519) to the list of known hosts.
    ubuntu@192.168.2.15: Permission denied (publickey,password).                                                               
  * 192.168.2.16               - FAILED!!! ------------------------------------------------------
    Failed to connect to the host via ssh: Warning: Permanently added '192.168.2.16' (ED25519) to the list of known hosts.
    ubuntu@192.168.2.16: Permission denied (publickey,password).                                                               
  * 192.168.2.17               - FAILED!!! ------------------------------------------------------
    Failed to connect to the host via ssh: Warning: Permanently added '192.168.2.17' (ED25519) to the list of known hosts.
    ubuntu@192.168.2.17: Permission denied (publickey,password).                                                               

# STATS *******************************************************************************************************************
192.168.2.14    : ok=0  changed=0       failed=0        unreachable=1   rescued=0       ignored=0
192.168.2.15    : ok=0  changed=0       failed=0        unreachable=1   rescued=0       ignored=0
192.168.2.16    : ok=0  changed=0       failed=0        unreachable=1   rescued=0       ignored=0
192.168.2.17    : ok=0  changed=0       failed=0        unreachable=1   rescued=0       ignored=0

What is the problem? Is it possible to run experiments on a single machine?