SLES321 corosync don'start on node1

I’m unable to continue my exercises.
On node1 service corosync do not start.
Running command
systemctl status corosync

I have error:

corosync.service: Unit not need anymore. Stopping
corosync.service: Failed to enque stopjob, ignoring: transaction is destructive.
starting Corosync Claster Engine…
Can’t not read file /etc/corosync/corosync.conf reason = (Not such file or directory)
corosync.service: unit entered failed state

On node1 file
does not exist, ma I have checked it is missing on node2 too (and here corosync is alive)
Best regards,

If the corosync.conf files are missing, the fastest and easiest solution is to reset your VMs. Click on the Reset button.