"The remote desktop session host server is in per device licensing mode and no redirector mode" error

Hi,

I got an error in RDP server 2008 

The remote desktop session host server is in per device licensing mode and no redirector mode,
but the license server does not have any installed licenses with the following attributes
Product Windows Server 2008 or Windows Server 2008 R2 Licensing mode:
Per Device License type: RDS CALs or VDI.

In the license manager section, the green checkbox is checked but the error still exists. I reactivated the license but the problem has not been solved. Any help would be appreciated. 

Thanks