Remote desktop connection error

Error when using remote desktop connection ：
Because there is no remote desktop license server that can provide a license , Remote session interrupted . Please contact the server administrator .

english :
The remote session was disconnected because there are no Remote Desktop License Servers available to provide a license.Please contact the server administrator.

Solution reference ：
https://cloud.tencent.com/developer/article/1068337

https://ravingroo.com/949/server-2012-rds-no-remote-desktop-license-servers-available/

Solution ：
Delete... From the registry "GracePeriod"

Specifically ：
1 Search Registry Editor
2 Follow the path below to find GracePeriod
\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM
And then find GracePeriod
3. Set full control for this item , Then delete
4. Restart the remote host