vxlogmgr log File Deletion failed

Can anyone help? I have a 5240 Netbackup Appliance , but recently I found that the web console cannot be logged in. I checked that the log directory is 100% used. I try to use vxlogmar to clean the logs, but it cannot be deleted . What else can I do? , thanks

maintenance-!> vxlogmgr --del -e '12/31/2020 12:00:00 PM' -o nbrb

Following are the files that were found:

   /usr/openv/logs/nbrb/51216-118-3536980490-200410-0000000000.log
   /usr/openv/logs/nbrb/51216-118-3536980490-200518-0000000000.log
   /usr/openv/logs/nbrb/51216-118-3536980490-200521-0000000000.log

Total 3 file(s)

Are you sure you want to delete the file(s)? (Y/N):
y

Deleting /usr/openv/logs/nbrb/51216-118-3536980490-200410-0000000000.log ...
/usr/openv/logs/nbrb/51216-118-3536980490-200410-0000000000.log File Deletion failed

Deleting /usr/openv/logs/nbrb/51216-118-3536980490-200518-0000000000.log ...
/usr/openv/logs/nbrb/51216-118-3536980490-200518-0000000000.log File Deletion failed

Deleting /usr/openv/logs/nbrb/51216-118-3536980490-200521-0000000000.log ...
/usr/openv/logs/nbrb/51216-118-3536980490-200521-0000000000.log File Deletion failed