Error when installing Xendesktop 5.0 via express deployment

Hi,
I was trying to install Xendesktop 5.0 via an express deployment.
Then when I tried to connect to the vCenter to add the VMware host, I got this error message, see screenshot below.
The vCenter is pingable.
Well, I have found a site that this is related to an SSL error which I tried to fix but this wouldn’t solve the problem.
Any advice?
Please help.

Desktop Studio
The hypervisor was not contactable at the supplied address.
