Plesk Backup Problem Unable get daemon current status: Unable to create UNIX socket /usr/local/psa/tmp/agent-runner

In plesk (8.x) this error appear when I try to press on “Backup” button on a particular domain.”Unable get daemon current status: Unable to create UNIX socket /usr/local/psa/tmp/agent-runner.38023: Connection refused”


The solutions is to login to psa database and clear the table BackupsRunning (TRUNCATE BackupsRunning;)
Be sure you do a backup of the psa database before.