The virtual machine '%1' cannot be backed up because either the file groups reported during OnIdentify has changed, or the ...

The virtual machine '%1' cannot be backed up because either the file groups reported during OnIdentify has changed, or the supported backup type (hot backup or saved state backup) reported during OnIdentify has changed. Try not to perform any configuration changes to the virtual machine between OnIdentify and OnPrepareBackup. (Virtual machine ID %2)