Remote Desktop Connection License Issue

Error : The remote session was disconnected because there are no Remote Desktop client access licenses available for this computer. Please contact the server administrator.

The solution is to delete the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing

After deleting the key from the registry start Remote desktop connection as administrator by right clicking on the"mstsc.exe" icon in c:\windows\system32\mstsc.exe.