Cannot back up virtual machine '%1'. The virtual machine is configured for online backups, but an online backup cannot be ...

Cannot back up virtual machine '%1'. The virtual machine is configured for online backups, but an online backup cannot be performed. This can occur if any of the following conditions exist: Integration services are not installed or running in the guest operating system, the virtual machine is paused, or the virtual machine uses physical storage that is not compatible with the Volume Shadow Copy (VSS) service. Incompatible storage includes dynamic disks and FAT32-formatted disks. (Virtual machine ID %2)