[ovirt-users] OSError: [Errno 24] Too many open files

Hi guys I'm trying to install HE on a KVM host and installer cannot get pass this: [ ERROR ] OSError: [Errno 24] Too many open files [ ERROR ] fatal: [localhost]: FAILED! => {"msg": "Unexpected failure during module execution.", "stdout": ""} [ INFO  ] TASK [ovirt.ovirt.hosted_engine_setup : Sync on engine machine] [ ERROR ] fatal: [localhost]: FAILED! => {"msg": "Using a SSH password instead of a key is not possible because Host Key checking is enabled and sshpass does not support this.  Please add this host's fingerprint to your known_hosts file to manage this host."} [ ERROR ] Failed to execute stage 'Closing up': Failed executing ansible-playbook [ INFO  ] Stage: Clean up KVM itself should be satisfying in terms of requirements, as a setup of a HE version from 'master' repo worked previously on it. Any ideas & thoughts shared, on what is that cryptic error message saying and how to troubleshoot I'll very much appreciate. many thanks, L.