XML error

Symptoms

  1. You are backing up Microsoft Office 365 mailboxes.
  2. Backup finishes with warnings:
    .NET exception 'System.InvalidOperationException' has occurred: There is an error in XML document.
     
    Error code: 428
    Module: 91
    LineInfo: 0xF2DD8062218B0B1E
    Fields: {"$module":"arx_agent_fork_vsa64_3917"}
    Message: Some emails in folder 'XXXXXXXXXXXXXXXXXXX' will be skipped during backup.
    ------------------------
    Error code: 3101

The backup of any kind fails with the following error message:

Failed to parse the XML.

| error 0x3b0001: Failed to parse the XML.
| line: 0x9a79f20828bcab0
| file: e:\72\enterprise\mms\managers\location\impl\manager.cpp:832
| function: LocationManagement::LocationManagerImpl::AddLocation
| IsReturnCode: 0x1
| $module: disk_bundle_vsa64_4670