SQL Cluster backup with DDBoost failed

hello

I backed up the SQL cluster with DDBoost, but I get this error when I start backing up:

"" Check the detailed logs at 'C:\Program Files\DPSAPPS\MSAPPAGENT\logs\ddbmsqlsv.log'.
Failed to retrieve DD password. Error: 53000, Error encountered while retrieving information from the lockbox 'C:\Program Files\DPSAPPS\common\lockbox\agents.clb' for the device host 'X.X.X.X': The instance name key is missing from the Lockbox.  ""