Elasticsearch backup to S3 using AWS Cloud plugin

I recently started using elasticsearch together with logstash to setup an ELK stack for my servers.

I'm using this plugin here:

And I tried to simply create a repository to backup my snapshots of my indices:

curl -XPUT 'http://localhost:9200/_snapshot/es_backup' -d '{
    "type": "s3",
    "settings": {
            "bucket": "keyless-elasticsearch-backup",
    }
}'

And I'm getting this:

{"error":"RepositoryVerificationException[[es_backup] [i3KNe8D_Sh6UYwo2JwomwQ, 'RepositoryVerificationException[[es_backup] store location [myproj-elasticsearch-backup] is not shared between node [[Empath][i3KNe8D_Sh6UYwo2JwomwQ][myPC][inet[/192.168.2.125:9300]]] and the master node]']]]","status":500}

I googled it a lot, but nothing comes up with anyone else having the same problem like me.

First of all, I don't really understand the error. Can someone please explain what is it about and how can I fix it?