Explanation: This error occurs when a Vault job cannot access the following:
UNIX and Linux: /usr/openv/netbackup/vault/sessions Windows: install_path\NetBackup\vault\sessions
This directory is created when Vault is installed.
Recommended Action: Make sure you are running on the master server where Vault is installed and configured. Also ensure that no one accidentally removed the sessions directory or changed permission on the directory path so it is inaccessible to the Vault job.