Troubleshooting windows firewall service (MPSSVC).

Hi TechyV buddies!
I am having some problem with windows firewall. When I try to open windows firewall I get this error message:
There was an error opening the windows firewall with Advanced Security snap-in
The Windows Firewall with Advanced Security snap-in failed to load. Restart the Windows Firewall service on the computer that you are managing. Error code: 0x6D9

Can you tell me what the problem of my windows firewall is? I would really appreciate the effort in helping.
Thank you!
