Solution: Go to Control Panel - Network and Sharing Center. Choose homegroup and sharing options and click ´Leave the homegroup´.
Why did this happen? You probably attempted to disable Microsoft Home Group by changing ´Home network´ to ´public network in the ´Network and Sharing Center´. It is easy to assume that if you press on ´Home network´ under ´Connect or disconnect´ that Home Network will be disconnected. It will not. Changing ´Home network´ to ´Public network´ in Network and Sharing Center does not disconnect or connect anything. It is just switching off/on windows firewall rules for MS Home Network.
Other related errors - Microsoft-Windows-HomeGroup Control Panel/Operational Get Sharing Flags failed. Details: ???