Management class - "class name" in domain "domain Name" used by node "node
name" in file space "filespace name" is no longer active, or no longer has
a backup copy group:  Default management class attributes will be used for
expriation.

Explanation:  During policy roll-off processing, the server has found a
client file copy whose managemnet class or backup copy group no longer
exists.

System action:  The server obtains the default management class for the
specified domain and uses its backup copy group version and retension
parameters to determin if file copies need to be expired.

What you need to do:  "With Authority over the specified domain"  Use the
Define Copygroup
Define Mgmtclass, and Activate Policy commands to define and activate a
policy set that contains definitions for the missing class or copy group.