"console" option is greyed out for VMs

Dear All,

I have installed RHEV-M 3.1. The Hypervisor is version 6.3. And the host OS is RHEL 6.4.

The Problem is: "the console" option is greyed(find out the attached screenshot) out for VMs, so i can't take the console of virtual machine.

Please help me to resolve the issue.

Please find out the attached screenshot.

Thanks & Regards,

Somnath