'ERROR: BackupManager encountered an exception: 'PluginError' object has no attribute 'errorcode' ' when taking VAMI backup for vCenter using NFS protocol

Products

• VMware vCenter Server

Issue/Introduction

• vCenter VAMI backup using NFS protocol fails with error "BackupManager encountered an exception".


• In /var/log/vmware/applmgmt/backup.log:
  

  YYYY-MM-DDTHH:MM:SS [20250522-151006-243#####] [MainProcess:PID-3458###] [MountedFSStorageIOLib::_run_timed_cmd:MountedFSStorageIOLib.py:118] ERROR: Cmd ['/usr/bin/mount', '-t', 'nfs', '<backup directory>', '/storage/remote/backup/nfs/<backup server>/AxCcg###/iX4Ga###', '-o', 'hard,intr'] timed out with timeout 120 seconds.

  YYYY-MM-DDTHH:MM:SS [20250522-151006-243#####] [MainProcess:PID-3458###] [BackupManager::main:BackupManager.py:591] ERROR: BackupManager encountered an exception: 'PluginError' object has no attribute 'errorcode'

Environment

VMware vCenter Server 7.x
VMware vCenter Server 8.x

Cause

• The file /usr/lib/applmgmt/backup_restore/py/vmware/appliance/backup_restore/plugins/MountedFSStorageIOLib.py has an invalid parameter.

Resolution

To workaround the issue, please fix the invalid parameter by following the steps below:

• Take a backup copy of the file MountedFSStorageIOLib.py:
  cp /usr/lib/applmgmt/backup_restore/py/vmware/appliance/backup_restore/plugins/MountedFSStorageIOLib.py /storage/core/MountedFSStorageIOLib.py.backup


• Replace line 200 in the file:
  BEFORE 
  except PluginError as e:
                # Both mount and timeout might happen simultaneously
                if e.errcode == ErrorCodes.timeout:
                   logger.error("Mount command failed with timeout exception")
  
  AFTER
  except PluginError as e:
              # Both mount and timeout might happen simultaneously
              if e.errcode == ErrCodes.timeout:
                 logger.error("Mount command failed with timeout exception")
      
• Restart the applmgmt service:
  service-control --restart applmgmt