Cannot reset password for Windows KVM virtual server: This virtual server may not be linux or Windows

Symptoms 

Attempt to reset password for KVM Windows-based VPS via SolusVM web interface fails:

SVM_ERROR: Error!
Root/Administrator password could not be changed.
This virtual server may not be linux or Windows

The following article has been applied, but it does not fix the issue.

The mount directory of the VPS is not empty (in the example below kvm2914 is a KVM ID of the virtual server):

# ls -l /home/kvm/kvm2914/mnt/
total 4
drwxr-xr-x 2 root root 4096 Dec 25 17:18 vmservice

Cause

 Attempt to mount VPS image fails because mount point is not empty.

Resolution

1. Stop the virtual server
2. Connect to the slave KVM node via SSH
3. Remove all the content from mnt subdirectory /home/kvm/kvmID/mnt/:

   # rm -rf /home/kvm/kvmID/mnt/*

   Note: kvmID should be replaced with actual ID of the virtual server