There is no Licensing part in web client

I have installed a new vSphere 6 environtment.with external Platform Services Controller. There was no error or warning during the installation. But, when I connect to the vCenter server with the Web client, I cannot see the Licensing part of the Administration menu. I use the Administrator@vsphere.local account, so the permissions are ok. When I want to add a host to the vCenter, I also get an error message related to license management:

The class com.vmware.license.client.cis.components.AssignLicenseFormFactory is not exported by any plugin.

I installed the newest version of vCenter.

Thanks in advance for any tips or help.

Zoli