Xibo on ubuntu getting Fatal Error

Guys, wondering if you could help. This is what i get

Fatal Error - sorry this shouldn't happen.
SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Try again

docker ps command gives me;

CONTAINER ID   IMAGE                                COMMAND                  CREATED          STATUS                          PORTS                                                  NAMES
aee16dec62d6   xibosignage/xibo-cms:release-3.1.4   "/entrypoint.sh"         10 minutes ago   Up 10 minutes                   0.0.0.0:80->80/tcp, :::80->80/tcp                      xibo_cms-web_1
6625ee11260c   xibosignage/xibo-xmr:0.9             "/entrypoint.sh"         10 minutes ago   Up 10 minutes                   0.0.0.0:9505->9505/tcp, :::9505->9505/tcp, 50001/tcp   xibo_cms-xmr_1
3c5809fd8592   ianw/quickchart                      "node --max-http-hea…"   10 minutes ago   Up 10 minutes                   3400/tcp                                               xibo_cms-quickchart_1
7ea07f29cef4   mysql:5.7                            "docker-entrypoint.s…"   10 minutes ago   Restarting (1) 32 seconds ago                                                          xibo_cms-db_1
8507023c9973   memcached:alpine                     "docker-entrypoint.s…"   10 minutes ago   Up 10 minutes                   11211/tcp                                              xibo_cms-memcached_1

Can someone help please?