Several ERROR messages during chef-server-ctl restore

As specified in the documentation, I did a chef-server-ctl backup and then a chef-server-ctl restore /path/to/backup -c in a new server.

The restore process completed with the following errors:

I think all of these errors are due to existing records already in the database after a Chef install.

At the end, I can communicate with the new server using knife and I see the nodes and users.

Is it safe to ignore these errors or is there a missing step in the restore process as explained in the documentation?