Avamar backup issue

We observe intermittent backup failures in most of the clients with the below error.

Tried with manual backup as well.

2021-11-09 14:52:55 avagent Info <5964>: Requesting work from xxx.com
2021-11-09 14:52:56 avagent Info <5264>: Workorder received:
2021-11-09 14:52:56 avagent Error <5011>: Unknown message type
2021-11-09 14:53:06 avagent Info <7185>: Performing a command failure sleep of 600 seconds
2021-11-09 15:03:06 avagent Info <40019>: Checking certificate status.

Did the client received the wrong work order, as I we see the Error code at same time when we got the work order?

can someone help here?